fix(evmtool): use excessBlobGas from test environment in state-test

[bshastry]

Summary

Fix evmtool state-test command to correctly use currentExcessBlobGas from the test environment when calculating blob gas price, instead of always using zero.

Fixed Issue(s)

N/A - This fix addresses a consensus divergence (only via the statetest interface) discovered during differential fuzzing with goevmlab.

---

Thanks for sending a pull request! Have you done the following?

• Checked out our contribution guidelines?
• Considered documentation and added the doc-change-required label to this PR if updates are required.
• Considered the changelog and included an update if required. (evmtool fix, not user-facing)
• For database changes (e.g. KeyValueSegmentIdentifier) considered compatibility and performed forwards and backwards compatibility tests (N/A - no database changes)

Locally, you can run these tests to catch failures early:

• spotless: ./gradlew spotlessApply
• unit tests: ./gradlew :ethereum:evmtool:test --tests StateTestSubCommandTest
• acceptance tests: ./gradlew acceptanceTest (not required for evmtool changes)
• integration tests: ./gradlew integrationTest (not required for evmtool changes)
• reference tests: ./gradlew ethereum:referenceTests:referenceTests (not applicable)
• hive tests: Engine or other RPCs modified? (N/A - evmtool only)

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Description

The StateTestSubCommand was hardcoding BlobGas.ZERO when calculating blob gas price for EIP-4844 transaction validation:

// Before (incorrect):
final Wei blobGasPrice = protocolSpec.getFeeMarket().blobGasPricePerGas(BlobGas.ZERO);

// After (correct):
final BlobGas excessBlobGas = blockHeader.getExcessBlobGas().orElse(BlobGas.ZERO);
final Wei blobGasPrice = protocolSpec.getFeeMarket().blobGasPricePerGas(excessBlobGas);

This caused the BLOBBASEFEE opcode (0x4a) to always return 1 (minimum blob gas price) regardless of what currentExcessBlobGas was specified in the test environment.

Impact

With excessBlobGas=0x240000 (2,359,296) and Cancun's blob fee update fraction (3,338,477):

• Before fix: BLOBBASEFEE returns 1 (using zero excess blob gas)
• After fix: BLOBBASEFEE correctly returns 2 (using actual excess blob gas)

This affects:

• State test execution producing incorrect state roots when tests use non-zero currentExcessBlobGas
• Blob transaction validation using incorrect blob gas prices
• Differential testing against geth showing false positives

Test Plan

• Added unit test shouldUseExcessBlobGasFromEnvironment that verifies correct blob gas price calculation
• Verified state root matches geth output for test with currentExcessBlobGas=0x240000
• All existing StateTestSubCommandTest tests pass

Notes

• This is a developer tooling fix for evmtool, not a change to core Besu consensus
• The fix mirrors how GeneralStateReferenceTestTools correctly handles excess blob gas
• Similar fix was applied to REVM (commit 652419e6) for the same class of bug

[macfarla]

Thanks for the fix @bshastry - there is one EvmToolSpecTests failing -

Cannot invoke "com.fasterxml.jackson.databind.JsonNode.isTextual()" because "cliNode" is null
java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonNode.isTextual()" because "cliNode" is null
	at org.hyperledger.besu.evmtool.EvmToolSpecTests.testBySpec(EvmToolSpecTests.java:138)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)

[bshastry]

Thanks for the fix @bshastry - there is one EvmToolSpecTests failing -

Cannot invoke "com.fasterxml.jackson.databind.JsonNode.isTextual()" because "cliNode" is null
java.lang.NullPointerException: Cannot invoke "com.fasterxml.jackson.databind.JsonNode.isTextual()" because "cliNode" is null
	at org.hyperledger.besu.evmtool.EvmToolSpecTests.testBySpec(EvmToolSpecTests.java:138)
	at java.base/java.lang.reflect.Method.invoke(Method.java:580)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:179)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:184)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)

I fixed it in the later commit. Hopefully, this should pass all checks 🙏