ref: Migrate app state manager to Swift

[github-actions]

Note

The pull request "ref: Migrate app state manager to Swift" was created by @philprime but did not reference an issue. Therefore this issue was created for better visibility in external tools like Linear.

📜 Description

Migrates the private app-state lifecycle manager from Objective-C into SentryAppStateManager.

The manager now owns lifecycle notification observation and uses a composed dependency-provider interface for its crash reporter, file manager, sysctl wrapper, dispatch queue, and notification center.

💡 Motivation and Context

The Objective-C helper had a single consumer. Inlining its behavior keeps app-state lifecycle logic together while removing the obsolete private Objective-C header and implementation.

💚 How did you test it?

• make format
• make analyze
• make build-ios FOR_AGENTS=true
• make test-ios FOR_AGENTS=true ONLY_TESTING=SentryTests/SentryAppStateManagerTests,SentryTests/SentryAppStartTrackerTests,SentryTests/SentryWatchdogTerminationLogicTests,SentryTests/SentryWatchdogTerminationTrackerTests,SentryTests/SentryWatchdogTerminationIntegrationTests

📝 Checklist

• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.
• If I added a new public API, I also added it to the SentryObjC wrapper.

[linear-code]

COCOA-1799