fix(ios): add log advice back when using shadow w/o a background

[hannojg]

Summary:

Back on old arch in RCTView.m we printed that warning:

react-native/packages/react-native/React/Views/RCTView.m

Lines 898 to 906 in d13d2b0

	// Can't accurately calculate box shadow, so fall back to pixel-based shadow
	view.layer.shadowPath = nil;
	RCTLogAdvice(
	@"View #%@ of type %@ has a shadow set but cannot calculate "
	"shadow efficiently. Consider setting a solid background color to "
	"fix this, or apply the shadow to a more specific component.",
	view.reactTag,
	[view class]);

This was missing on new arch and due to it we were missing some unoptimized views in our app which tanked performance.

Changelog:

[IOS] [ADDED] - Print warning advice when using shadow* styles without providing a solid background color

Test Plan:

In rn-tester go to APIs > Box Shadow example to see the warnings printed!

[meta-codesync]

@fabriziocucci has imported this pull request. If you are a Meta employee, you can view this in D113008257.

[meta-codesync]

@fabriziocucci merged this pull request in eb4d389.