SentyCrashIntegration setting screen pixels can get stuck

[philipphofmann]

Description

The following code gets stuck

sentry-cocoa/Sources/Sentry/SentryCrashIntegration.m

Lines 273 to 276 in 372ffbe

	#if SENTRY_HAS_UIDEVICE
	[deviceData setValue:@(UIScreen.mainScreen.bounds.size.height) forKey:@"screen_height_pixels"];
	[deviceData setValue:@(UIScreen.mainScreen.bounds.size.width) forKey:@"screen_width_pixels"];
	#endif

when running the TestObserver with test configuration TestCI.

sentry-cocoa/Tests/SentryTests/TestUtils/SentryTestObserver.m

Lines 32 to 35 in 372ffbe

	{
	[[XCTestObservationCenter sharedTestObservationCenter]
	addTestObserver:[[SentryTestObserver alloc] init]];
	}

A temporary fix was done with #2285.

Ideally the code in SentryCrashIntegration would ensure that it can safely access UIScreen.mainScreen.