fix: Don't use main thread for app hang screenshot and view hierarchy #7457

Job	Run time
pod lint Sentry/HybridSDK	1m 34s
pod lint Sentry dynamic ios	3m 5s
Swift Lint	18s
Xcode Analyze	4m 19s
pod lint Sentry static ios	2m 58s
pod lint Sentry dynamic macos	3m 18s
pod lint Sentry static macos	3m 49s
pod lint Sentry dynamic tvos	3m 1s
pod lint Sentry static tvos	3m 2s
pod lint Sentry dynamic watchos	4m 32s
pod lint Sentry static watchos	2m 50s
pod lint SentrySwiftUI dynamic ios	1m 36s
pod lint SentrySwiftUI static ios	1m 44s
pod lint SentrySwiftUI dynamic macos	3m 4s
pod lint SentrySwiftUI static macos	2m 3s
pod lint SentrySwiftUI dynamic tvos	2m 3s
pod lint SentrySwiftUI static tvos	2m 3s
pod lint SentrySwiftUI dynamic watchos	1m 38s
pod lint SentrySwiftUI static watchos	1m 34s
	48m 31s

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