Mark XCTFail with @_disfavoredOverload

[davdroman]

In situations where XCTDynamicOverlay is implicitly imported in tests (such as by importing Dependencies), it might be useful to mark XCTFail with @_disfavoredOverload so XCTest's XCTFail can take precedence in tests without ambiguities.

Any thoughts? Is it worth a PR?

[lukeredpath]

I'm running into this issue now in some test utilities that import XCTest and ComposableArchitecture - any ideas on how to disambiguate this? XCTest.XCTFail doesn't work. This started happening when updating from 0.45 to 0.49

[tgrapperon]

Cross-linking pointfreeco/swift-dependencies#13 for future reference.

[stephencelis]

@davdroman Any interest in PRing this, or should we dive in? 😄

[davdroman]

Sure! I'll put something together shortly.

[davdroman]

It's up 😄 #46