refactor(internal/blocktest): add package for shared test code #27270

[gzliudan]

Proposed changes

Move the testHasher helper to internal/blocktest/test_hash.go and update all usages to import from there. This reduces code duplication and improves maintainability.

Ref: ethereum#27270

Types of changes

What types of changes does your code introduce to XDC network?
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• build: Changes that affect the build system or external dependencies
• ci: Changes to CI configuration files and scripts
• chore: Changes that don't change source code or tests
• docs: Documentation only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that neither fixes a bug nor adds a feature
• revert: Revert something
• style: Changes that do not affect the meaning of the code
• test: Adding missing tests or correcting existing tests

Impacted Components

Which parts of the codebase does this PR touch?
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• Consensus
• Account
• Network
• Geth
• Smart Contract
• External components
• Not sure (Please specify below)

Checklist

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• This PR has sufficient test coverage (unit/integration test) OR I have provided reason in the PR description for not having test coverage
• Tested on a private network from the genesis block and monitored the chain operating correctly for multiple epochs.
• Provide an end-to-end test plan in the PR description on how to manually test it on the devnet/testnet.
• Tested the backwards compatibility.
• Tested with XDC nodes running this version co-exist with those running the previous version.
• Relevant documentation has been updated as part of this PR
• N/A

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[Copilot]

Pull request overview

This PR refactors shared test-only hashing logic by extracting the testHasher helper into a new internal/blocktest package and updating existing tests/benchmarks to use the centralized helper, reducing duplication across packages.

Changes:

• Add internal/blocktest/test_hash.go with a shared NewHasher helper for transaction/receipt list hashing.
• Update internal/ethapi/api_test.go, core/types/block_test.go, and core/rawdb/accessors_indexes_test.go to use blocktest.NewHasher instead of local duplicated implementations.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
internal/ethapi/api_test.go	Removes local testHasher and switches to shared blocktest.NewHasher.
internal/blocktest/test_hash.go	Introduces the shared hasher implementation used by tests/benchmarks.
core/types/block_test.go	Removes duplicated hasher and uses blocktest.NewHasher in benchmark block creation.
core/rawdb/accessors_indexes_test.go	Removes duplicated hasher and uses blocktest.NewHasher via a local alias.

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