ci: Skip merge queue if pull request is up-to-date

[Mrtenz]

This adds a new action which determines whether a pull request in the merge queue is up-to-date, meaning:

• The pull request is based on the latest commit on main.
• The pull request is the first in the merge queue.

In this case, all status checks have already passed on the branch, and running in the merge queue would be redundant, meaning we can skip the merge queue checks.

---

Note

Adds a job to detect up-to-date PRs in merge groups and conditionally skip subsequent checks, adjusting dependencies and final pass gating accordingly.

• CI Workflow (.github/workflows/main.yml)
  • New job: check-skip-merge-queue to detect up-to-date PRs during merge_group using MetaMask/github-tools/.../check-skip-merge-queue@v1.
  • Conditional execution: check-workflows now needs: check-skip-merge-queue and is skipped in merge_group when skip-merge-queue is true.
  • Final gating: all-jobs-pass now depends on both all-jobs-complete and check-skip-merge-queue, passing if either all jobs passed or skip-merge-queue is true.
  • Minor wiring: checkout only during merge_group for the new job; propagate skip-merge-queue via job outputs.

^{Written by Cursor Bugbot for commit 390987f. This will update automatically on new commits. Configure here.}

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.33%. Comparing base (3624460) to head (390987f).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3786   +/-   ##
=======================================
  Coverage   98.33%   98.33%           
=======================================
  Files         420      420           
  Lines       12032    12032           
  Branches     1874     1874           
=======================================
  Hits        11832    11832           
  Misses        200      200           

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