Serialize wallet + mpool tests

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

Reference issue to close (if applicable)

Closes

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

• Bug Fixes

  • Improved reliability of JSON-RPC calls by adding controlled retries for transient failures.
  • Reduced potential conflicts during wallet-based test operations.

• Tests

  • Limited test execution to a single concurrent thread for more consistent results.
  • Simplified wallet test requests by removing repeated retry attempts.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch shashank/wallet-test

✨ Simplify code

• Create PR with simplified code
• Commit simplified code in branch shashank/wallet-test

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[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.04%. Comparing base (a6f303b) to head (2515155).
⚠️ Report is 1 commits behind head on main.
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/dev/subcommands/tests_cmd/helpers.rs	0.00%	3 Missing ⚠️
src/dev/subcommands/tests_cmd/wallet.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
src/dev/subcommands/tests_cmd/wallet.rs	0.00% <0.00%> (ø)
src/dev/subcommands/tests_cmd/helpers.rs	0.00% <0.00%> (ø)

... and 7 files with indirect coverage changes

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