feat(hosting): track foreign subviews and report unsupported additions

[Kyle-Ye]

Summary

• Track foreign subview additions and removals in UIKit and AppKit hosting views while excluding rendered content.
• Report unsupported additions with v7 linked semantics, using the appropriate host name and cached internal-build detection for UIKit.
• Share runtime-issue test support and add regression tests for didAddSubview on both platforms.

Validation: The focused UIKit and AppKit hosting-view tests each passed with one test and no failures.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	1198	0	1198	4a34b4fbb

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	38.5s	4a34b4fbb

[codecov]

Codecov Report

❌ Patch coverage is 95.23810% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 29.66%. Comparing base (06f828f) to head (c6a4b07).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...ntegration/Hosting/AppKit/View/NSHostingView.swift	95.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1076      +/-   ##
==========================================
- Coverage   29.70%   29.66%   -0.04%     
==========================================
  Files         799      802       +3     
  Lines       63094    63274     +180     
==========================================
+ Hits        18741    18770      +29     
- Misses      44353    44504     +151     

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