fix: Guard FramesTracker start and stop #9049

Job	Run time
pod lint Sentry/HybridSDK	3m 26s
pod lint Sentry dynamic ios	4m 32s
Swift Lint	15s
pod lint Sentry static ios	4m 52s
pod lint Sentry dynamic macos	6m 29s
Xcode Analyze	6m 4s
pod lint Sentry static macos	10m 47s
pod lint Sentry dynamic tvos	5m 44s
pod lint Sentry static tvos	5m 12s
pod lint Sentry dynamic watchos	4m 12s
pod lint Sentry static watchos	5m 59s
pod lint SentrySwiftUI dynamic ios	3m 42s
pod lint SentrySwiftUI static ios	3m 20s
pod lint SentrySwiftUI dynamic macos	3m 32s
pod lint SentrySwiftUI static macos	3m 42s
pod lint SentrySwiftUI dynamic tvos	3m 38s
pod lint SentrySwiftUI static tvos	7m 12s
pod lint SentrySwiftUI dynamic watchos	4m 4s
pod lint SentrySwiftUI static watchos	4m 43s
	1h 31m 25s

Provide feedback