Enable Tuist Xcode caching and build insights in CI

[Kyle-Ye]

Summary

• update Tuist to 4.203.1 for the root and Example projects
• configure Xcode compilation caching with uploads limited to CI
• authenticate CI through GitHub OIDC and initialize the Tuist cache service
• route Xcode-driven CI and XCFramework archives through tuist xcodebuild with result bundles
• centralize Tuist setup, cache health checks, and local fallback behavior in a shared script

Motivation

Reuse compilation outputs across CI runs while reporting build timing and cache effectiveness through Tuist. Cache health checks also prevent unavailable cache services from stalling builds.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 32.17%. Comparing base (d39facb) to head (bb16773).

Additional details and impacted files

@@ Coverage Diff @@## main #232 +/- ##
=======================================
Coverage 32.17% 32.17% =======================================
Files 71 71 Lines 2601 2601 =======================================
Hits 837 837 Misses 1764 1764 

Flag	Coverage Δ
ios	32.19% <ø> (ø)
macos	10.15% <ø> (ø)
ubuntu	12.03% <ø> (ø)

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• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.

[tuist]

🛠️ Tuist Run Report 🛠️

Tests 🧪

Scheme	Status	Cache hit rate	Tests	Skipped	Ran	Commit
OpenAttributeGraph-Package	✅	0 %	137	0	137	8de2fc41f

Builds 🔨

Scheme	Status	Duration	Commit
OpenAttributeGraph	✅	11.6s	8de2fc41f
OpenAttributeGraph-Package	✅	26.4s	8de2fc41f

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