Improve log for stateful API check

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Add log which will help to investigate if eth_new_pending_transaction_filter check fails in stateful API check.

Reference issue to close (if applicable)

Closes #6462

Other information and links

Change checklist

• I have performed a self-review of my own code,
• I have made corresponding changes to the documentation. All new code adheres to the team's documentation standards,
• I have added tests that prove my fix is effective or that my feature works (if possible),
• I have made sure the CHANGELOG is up-to-date. All user-facing changes should be reflected in this document.

Outside contributions

• I have read and agree to the CONTRIBUTING document.
• I have read and agree to the AI Policy document. I understand that failure to comply with the guidelines will lead to rejection of the pull request.

Summary by CodeRabbit

• Tests
  • Enhanced error messages and assertions in Ethereum API filter operations for improved debugging and diagnostics.

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[coderabbitai]

Walkthrough

This PR improves error diagnostics in stateful API tests by refining ownership handling and enhancing error messages. The changes address flaky test conditions in eth_get_filter_logs and eth_new_pending_transaction_filter by using references where appropriate and providing more detailed failure context.

Changes

Cohort / File(s)	Summary
Stateful API test improvements src/tool/subcommands/api_cmd/stateful_tests.rs	Enhanced eth_new_pending_transaction_filter with reference iteration (&hashes) and improved assertions with detailed error messages showing prev_hashes, hashes, cid, and cids. Updated eth_get_filter_logs error message formatting for filter_spec and cid using debug output.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Fix flaky stateful API check  #6463: Both PRs modify the same test file with ownership/clone fixes and improved error messages for empty logs including filter_spec and cid.
• fix eth_get_filter_logs test #6363: Both PRs modify the eth_get_filter_logs test, improving error reporting and test flow behavior.
• fix eth_newPendingTransactionFilter test #6361: Both PRs modify the eth_new_pending_transaction_filter test, addressing how pending transaction hashes and CIDs are validated.

Suggested labels

RPC

Suggested reviewers

• LesnyRumcajs
• akaladarshi

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly describes the main change: improving logging for stateful API checks to help diagnose failures.
Linked Issues check	✅ Passed	The PR adds detailed error messages and logging to eth_new_pending_transaction_filter and eth_get_filter_logs functions to help diagnose the flaky stateful API check failures reported in issue #6462.
Out of Scope Changes check	✅ Passed	All changes are directly related to improving logging and error messages for the stateful API check functions, which is within the scope defined by issue #6462.

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✨ Finishing touches

• 📝 Generate docstrings

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