ui: unregister interactive timeout callbacks

[danielpolimac]

Summary

Add interactive-timeout callback removal and tie callbacks owned by temporary cabin-camera and onboarding widgets to their show and hide lifecycle.

Callback registration is idempotent, removal is safe when already absent, and timeout dispatch uses a snapshot so a callback can hide its widget and unregister itself without skipping the next callback.

Closes #37536

Validation

• Added coverage for duplicate registration and idempotent removal.
• Added coverage for unregistering during callback dispatch.
• 2 tests passed.
• Ruff and git diff checks passed.

[github-actions]

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✅ 0 changed, 66 passed, 0 errors

[danielpolimac]

The failing unit tests and Create UI Report jobs are blocked by the missing Raylib headless runtime dependency (libGLESv2.so.2), before this change runs. #38619 contains the isolated CI fix and is fully green. All remaining checks on this PR pass.