remove mac os from CI

[harsha-simhadri]

Will add back macos runner back later as part of nightly

[Copilot]

Pull request overview

This PR updates the GitHub Actions CI workflow to stop running the workspace test jobs on macOS runners (with the intent to reintroduce macOS coverage later).

Changes:

• Removed macos-latest from the test-workspace job OS matrix.
• Removed macos-latest from the test-workspace-features (all-features) job OS matrix.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 89.47%. Comparing base (3d3ed4c) to head (611c944).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1051      +/-   ##
==========================================
- Coverage   90.60%   89.47%   -1.13%     
==========================================
  Files         461      461              
  Lines       85494    85559      +65     
==========================================
- Hits        77462    76557     -905     
- Misses       8032     9002     +970     

Flag	Coverage Δ
miri	89.47% <ø> (-1.13%)	⬇️
unittests	89.32% <ø> (-1.25%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.
see 46 files with indirect coverage changes

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.