refactor(target_chains/ethereum): clean up unused batch update code

target_chains/ethereum/contracts/contracts/pyth/Pyth.sol

@@ -175,76 +175,6 @@ abstract contract Pyth is
         if (price.publishTime == 0) revert PythErrors.PriceFeedNotFound();
     }
 
-    function parseBatchAttestationHeader(
-        bytes memory encoded
-    )
-        internal
-        pure
-        returns (uint index, uint nAttestations, uint attestationSize)
-    {
-        unchecked {
-            index = 0;
-
-            // Check header
-            {
-                uint32 magic = UnsafeBytesLib.toUint32(encoded, index);
-                index += 4;
-                if (magic != 0x50325748) revert PythErrors.InvalidUpdateData();
-
-                uint16 versionMajor = UnsafeBytesLib.toUint16(encoded, index);
-                index += 2;
-                if (versionMajor != 3) revert PythErrors.InvalidUpdateData();
-
-                // This value is only used as the check below which currently
-                // never reverts
-                // uint16 versionMinor = UnsafeBytesLib.toUint16(encoded, index);
-                index += 2;
-
-                // This check is always false as versionMinor is 0, so it is commented.
-                // in the future that the minor version increases this will have effect.
-                // if(versionMinor < 0) revert InvalidUpdateData();
-
-                uint16 hdrSize = UnsafeBytesLib.toUint16(encoded, index);
-                index += 2;
-
-                // NOTE(2022-04-19): Currently, only payloadId comes after
-                // hdrSize. Future extra header fields must be read using a
-                // separate offset to respect hdrSize, i.e.:
-                //
-                // uint hdrIndex = 0;
-                // bpa.header.payloadId = UnsafeBytesLib.toUint8(encoded, index + hdrIndex);
-                // hdrIndex += 1;
-                //
-                // bpa.header.someNewField = UnsafeBytesLib.toUint32(encoded, index + hdrIndex);
-                // hdrIndex += 4;
-                //
-                // // Skip remaining unknown header bytes
-                // index += bpa.header.hdrSize;
-
-                uint8 payloadId = UnsafeBytesLib.toUint8(encoded, index);
-
-                // Skip remaining unknown header bytes
-                index += hdrSize;
-
-                // Payload ID of 2 required for batch headerBa
-                if (payloadId != 2) revert PythErrors.InvalidUpdateData();
-            }
-
-            // Parse the number of attestations
-            nAttestations = UnsafeBytesLib.toUint16(encoded, index);
-            index += 2;
-
-            // Parse the attestation size
-            attestationSize = UnsafeBytesLib.toUint16(encoded, index);
-            index += 2;
-
-            // Given the message is valid the arithmetic below should not overflow, and
-            // even if it overflows then the require would fail.
-            if (encoded.length != (index + (attestationSize * nAttestations)))
-                revert PythErrors.InvalidUpdateData();
-        }
-    }
-
     function parsePriceFeedUpdatesInternal(
         bytes[] calldata updateData,
         bytes32[] calldata priceIds,

target_chains/ethereum/contracts/forge-test/utils/PythTestUtils.t.sol

@@ -324,26 +324,6 @@ abstract contract PythTestUtils is Test, WormholeTestUtils, RandTestUtils {
         );
     }
 
-    // Generates a VAA for the given attestations.
-    // This method calls generatePriceFeedUpdatePayload and then creates a VAA with it.
-    // The VAAs generated from this method use block timestamp as their timestamp.
-    function generateWhBatchUpdate(
-        PriceAttestation[] memory attestations,
-        uint64 sequence,
-        uint8 numSigners
-    ) public returns (bytes memory vaa) {
-        bytes memory payload = generatePriceFeedUpdatePayload(attestations);
-
-        vaa = generateVaa(
-            uint32(block.timestamp),
-            SOURCE_EMITTER_CHAIN_ID,
-            SOURCE_EMITTER_ADDRESS,
-            sequence,
-            payload,
-            numSigners
-        );
-    }
-
     function pricesToPriceAttestations(
         bytes32[] memory priceIds,
         PythStructs.Price[] memory prices

target_chains/ethereum/sdk/solidity/IPythEvents.sol

@@ -15,9 +15,4 @@ interface IPythEvents {
         int64 price,
         uint64 conf
     );
-
-    /// @dev Emitted when a batch price update is processed successfully.
-    /// @param chainId ID of the source chain that the batch price update comes from.
-    /// @param sequenceNumber Sequence number of the batch price update.
-    event BatchPriceFeedUpdate(uint16 chainId, uint64 sequenceNumber);
 }

target_chains/ethereum/sdk/solidity/MockPyth.sol

@@ -7,7 +7,6 @@ import "./PythErrors.sol";
 
 contract MockPyth is AbstractPyth {
     mapping(bytes32 => PythStructs.PriceFeed) priceFeeds;
-    uint64 sequenceNumber;
 
     uint singleUpdateFeeInWei;
     uint validTimePeriod;
@@ -41,10 +40,6 @@ contract MockPyth is AbstractPyth {
         uint requiredFee = getUpdateFee(updateData);
         if (msg.value < requiredFee) revert PythErrors.InsufficientFee();
 
-        // Chain ID is id of the source chain that the price update comes from. Since it is just a mock contract
-        // We set it to 1.
-        uint16 chainId = 1;
-
         for (uint i = 0; i < updateData.length; i++) {
             PythStructs.PriceFeed memory priceFeed = abi.decode(
                 updateData[i],
@@ -64,12 +59,6 @@ contract MockPyth is AbstractPyth {
                 );
             }
         }
-
-        // In the real contract, the input of this function contains multiple batches that each contain multiple prices.
-        // This event is emitted when a batch is processed. In this mock contract we consider there is only one batch of prices.
-        // Each batch has (chainId, sequenceNumber) as it's unique identifier. Here chainId is set to 1 and an increasing sequence number is used.
-        emit BatchPriceFeedUpdate(chainId, sequenceNumber);
-        sequenceNumber += 1;
     }
 
     function getUpdateFee(

target_chains/ethereum/sdk/solidity/abis/AbstractPyth.json

@@ -14,25 +14,6 @@
     "name": "StalePrice",
     "type": "error"
   },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "uint16",
-        "name": "chainId",
-        "type": "uint16"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "sequenceNumber",
-        "type": "uint64"
-      }
-    ],
-    "name": "BatchPriceFeedUpdate",
-    "type": "event"
-  },
   {
     "anonymous": false,
     "inputs": [

target_chains/ethereum/sdk/solidity/abis/IPyth.json

@@ -1,23 +1,4 @@
 [
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "uint16",
-        "name": "chainId",
-        "type": "uint16"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "sequenceNumber",
-        "type": "uint64"
-      }
-    ],
-    "name": "BatchPriceFeedUpdate",
-    "type": "event"
-  },
   {
     "anonymous": false,
     "inputs": [

target_chains/ethereum/sdk/solidity/abis/IPythEvents.json

@@ -1,23 +1,4 @@
 [
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "uint16",
-        "name": "chainId",
-        "type": "uint16"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "sequenceNumber",
-        "type": "uint64"
-      }
-    ],
-    "name": "BatchPriceFeedUpdate",
-    "type": "event"
-  },
   {
     "anonymous": false,
     "inputs": [

target_chains/ethereum/sdk/solidity/abis/MockPyth.json

@@ -45,25 +45,6 @@
     "name": "StalePrice",
     "type": "error"
   },
-  {
-    "anonymous": false,
-    "inputs": [
-      {
-        "indexed": false,
-        "internalType": "uint16",
-        "name": "chainId",
-        "type": "uint16"
-      },
-      {
-        "indexed": false,
-        "internalType": "uint64",
-        "name": "sequenceNumber",
-        "type": "uint64"
-      }
-    ],
-    "name": "BatchPriceFeedUpdate",
-    "type": "event"
-  },
   {
     "anonymous": false,
     "inputs": [