Limit CI workflows to self-hosted runners

[Kyle-Ye]

Problem

Although GitHub Actions is free for standard runners in public repositories, GitHub still tracks a gross usage amount internally. Once an organization's gross usage crosses a certain threshold, GitHub's fair use policy begins to throttle job scheduling — jobs sit in "Queued" state for extended periods or never get picked up at all. This affects the entire organization, not just the heavy-usage repository.

Summary

• Limit all macOS CI jobs to self-hosted runners to reduce GitHub Actions cost
• Updated runs-on in ios.yml, macos.yml, compatibility_tests.yml, and uitests.yml (6 jobs total)

Fix organization's free GitHub Actions credits being exhausted too quickly issue eg. #850

Test plan

• Verify CI jobs are picked up by self-hosted runner (Kyles-Mac-mini)
• Confirm all workflow jobs pass on self-hosted runner

[augmentcode]

🤖 Augment PR Summary

Summary: Updates macOS-related GitHub Actions workflows to run only on self-hosted runners to reduce GitHub-hosted CI cost.
Changes: Replaces runs-on: ${{ matrix.os }} with a runs-on label list that includes self-hosted plus the existing matrix.os across iOS, macOS, compatibility, and UI test workflows.

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[augmentcode]

Review completed. 1 suggestion posted.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 14.40%. Comparing base (c4fcb72) to head (4addf0d).
⚠️ Report is 1 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (c4fcb72) and HEAD (4addf0d). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (c4fcb72)	HEAD (4addf0d)
	2	1

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #851       +/-   ##
===========================================
- Coverage   27.19%   14.40%   -12.80%     
===========================================
  Files         673      634       -39     
  Lines       44166    39006     -5160     
===========================================
- Hits        12012     5619     -6393     
- Misses      32154    33387     +1233     

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