Concurrency guard for calibnet stateful api check

[sudo-shashank]

Summary of changes

Changes introduced in this pull request:

• Added job-level concurrency to calibnet-api-test-stateful preventing nonce collisions across PRs during contract invoke.

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.

Summary by CodeRabbit

• Chores
  • Updated CI/CD workflow configuration to optimize job execution behavior.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[coderabbitai]

Walkthrough

Adds a concurrency group configuration to the calibnet-api-test-stateful job in the GitHub Actions workflow, limiting concurrent executions of this job to one at a time.

Changes

Cohort / File(s)
GitHub Actions Workflow Configuration \.github/workflows/forest\.yml

Change Summary
Adds concurrency group calibnet-api-test-stateful to prevent multiple simultaneous executions of the job

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Suggested reviewers

• LesnyRumcajs
• hanabi1224
• akaladarshi

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly describes the main change: adding a concurrency guard to the calibnet stateful API check workflow.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

• 📝 Generate docstrings

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 61.02%. Comparing base (59fef10) to head (a245eda).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

see 8 files with indirect coverage changes

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