ci: test OAG and IAG backends on Ubuntu

[Kyle-Ye]

Summary

• Run Ubuntu tests with both OAG and IAG backends.
• Pin Compute source builds to 0.5.2-bugfix.1 in the mise configuration and Ubuntu workflow to include the demangler linkage fix.
• Update OpenAttributeGraph to include the non-Darwin IAG graph debug shims.
• Install Compute dependencies separately from Codecov dependencies.

Dependency

• OpenAttributeGraph #238
• Compute 0.5.2-bugfix.1

Validation

• Workflow lint and TOML validation pass.
• Linux manifest evaluation selects Compute 0.5.2-bugfix.1 for IAG and no Compute dependency for OAG.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenSwiftUI	✅	0 %	1161	0	1161	b49202d28

Builds 🔨

Scheme	Status	Duration	Commit
OpenSwiftUI	✅	1m 43s	5553d6bf2

[codecov]

Codecov Report

❌ Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 27.29%. Comparing base (0e5fb9d) to head (aa283f9).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
...es/OpenSwiftUI/View/Combine/SubscriptionView.swift	0.00%	1 Missing ⚠️
...ftUICore/Data/Binding/Binding+ObjectLocation.swift	0.00%	1 Missing ⚠️
...Data/Combine/AttributeInvalidatingSubscriber.swift	0.00%	1 Missing ⚠️
...wiftUICore/Data/Observation/ObservationUtils.swift	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main    #1051       +/-   ##
===========================================
+ Coverage   17.11%   27.29%   +10.17%     
===========================================
  Files         735      735               
  Lines       53937    54011       +74     
===========================================
+ Hits         9234    14740     +5506     
+ Misses      44703    39271     -5432     

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