Run Compute in the UI test workflow

[Kyle-Ye]

Summary

• Route the shared UI test action through Example/setup.sh so CI uses the same setup path as local runs.
• Add a Compute option for UI tests and include the OpenSwiftUI renderer + Compute configuration in the default UI test matrix.
• Keep workflow dispatch and /uitest flexible enough to request individual or all renderer/backend configurations.
• Add UI test access to the active attribute graph vendor and temporarily exclude known Compute-specific unstable snapshot cases.

Why

This lets CI exercise the Compute setup path directly, so setup regressions like #927 are covered by UI tests instead of only being found locally.

Validation

• macOS OSUI_UITests + Compute: passed
  • 136 total, 106 passed, 22 skipped, 8 expected failures, 0 failed
• iOS Simulator 18.5 OSUI_UITests + Compute: passed
  • 136 total, 112 passed, 20 skipped, 4 expected failures, 0 failed

[Kyle-Ye]

/uitest all all-configs

[augmentcode]

🤖 Augment PR Summary

Summary: This PR extends the UI test workflow to run OpenSwiftUI with the Compute backend and routes CI setup through the same Example/setup.sh entry point used locally.

Changes:

• Add a compute input to the shared UI test composite action and generate the Example project via setup.sh (with --compute when requested).
• Rework uitests.yml to support a configuration-based matrix (SwiftUI/OpenSwiftUI renderer × AttributeGraph/Compute) for push, workflow_dispatch, and /uitest issue comments.
• Update commit status contexts to include the configuration id (e.g. UI Tests / iOS / openswiftui-renderer-iag).
• Expose the active attribute-graph backend to UI tests (via OpenAttributeGraphShims) and gate known unstable snapshot suites/cases under Compute.
• Add documentation for running/dispatching UI test CI and the supported /uitest command arguments/aliases.
• Pin the Compute dependency in the Example project's Tuist Package.resolved.

Technical Notes: Compute configurations set OPENSWIFTUI_OPENATTRIBUTESHIMS_COMPUTE=1 and pass compute=true into the shared action so project generation uses the Compute mise environment.

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[augmentcode]

Review completed. 2 suggestions posted.

Comment augment review to trigger a new review at any time.

[Kyle-Ye]

/uitest all osui-iag

[Kyle-Ye]

/uitest all osui-iag