CI: move Apple Silicon macOS workflows to macos-26 (Tahoe)

[clintonsteiner]

Feature or enhancement

Proposal:

Update GitHub Actions workflows to run Apple Silicon macOS jobs on macos-26 (Tahoe)
GitHub runner images have moved forward, and we want CI coverage aligned with macOS 26 for Apple Silicon jobs while retaining Intel-specific coverage where explicitly configured.

Has this already been discussed elsewhere?

This is a minor feature, which does not need previous discussion elsewhere

Links to previous discussion of this feature:

No response

Linked PRs

• gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) #145099
• gh-145098: CI: move Apple Silicon iOS workflows to macos-26 (Tahoe), XCode-26, and iOS-26 #145722
• [3.14] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) #146412
• [3.13] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) (GH-146412) #146414
• [3.12] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) (GH-146412) (GH-146414) #146635
• [3.11] gh-145098: Run Apple Silicon macOS CI on macos-26 (Tahoe) (GH-145099) (GH-146412) (GH-146414) (GH-146635) #146638
• gh-145098: Use macos-15-intel instead of unstable macos-26-intel #148038
• [3.14] gh-145098: Use macos-15-intel instead of unstable macos-26-intel (GH-148038) #148076
• [3.13] gh-145098: Use macos-15-intel instead of unstable macos-26-intel (GH-148038) #148077

[clintonsteiner]

ios testing bug is fixed as mentioned here #145099 (comment) prevents merging the second piece, captured work in a draft pr here.
#145722