Update OpenCombine integration to 0.16.0

[Kyle-Ye]

Summary

• Update the optional OpenCombine dependency to 0.16.0.
• Add OpenCombine to the Tuist package configuration when enabled.
• Export the OpenCombine Published and ObservableObject compatibility aliases.
• Use KVO-backed Progress observation on Objective-C platforms while retaining the polling fallback elsewhere.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.67%. Comparing base (773e949) to head (61ac29a).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...Control/ProgressView/ProgressView+Foundation.swift	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1027      +/-   ##
==========================================
- Coverage   27.68%   27.67%   -0.01%     
==========================================
  Files         771      771              
  Lines       60962    60962              
==========================================
- Hits        16875    16872       -3     
- Misses      44087    44090       +3     

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[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	82	0	82	b5ac0b8cd

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	2m 35s	b5ac0b8cd