test: O11Y-685 - Manual way to test signals when app runs in background/foreground service

[agrognetti]

Summary

Adds a way to test the observability signals are being created even when the application is hidden but running a foreground or background service.

How did you test this change?

No tests needed

Are there any deployment considerations?

No, the code added just changes the Sample App

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Note

Adds Android foreground/background services that run 30s periodic observability logging, with new UI buttons to start them and manifest updates for permissions and service registration.

• Android sample app:
  • Services:
    • Add ObservabilityForegroundService with notification channel and foreground execution.
    • Add ObservabilityBackgroundService for non-foreground execution.
    • Shared task launchObservabilityLoggingTask logs every 5s for 30s via LDObserve.
  • ViewModel:
    • Convert to AndroidViewModel and add startForegroundService() and startBackgroundService() helpers.
  • UI (MainActivity):
    • Add buttons to start foreground/background services.
  • Manifest:
    • Declare android.permission.FOREGROUND_SERVICE.
    • Register ObservabilityForegroundService and ObservabilityBackgroundService.

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