Pull request Use SAMPLE_CODE_DISAMBIGUATOR for easier running on composed-swift/Composed-Demo

Config from https://developer.apple.com/documentation/avfoundation/cameras_and_media_capture/avcam_building_a_camera_app was used to make it easier to people checking out the repo to run the sample code. Only the team needs to be changed with this config.

Pull request Check for `CollectionCoordinator` rather than self on composed-swift/ComposedUI

Using embedded collection views with each one using a CollectionCoordinator would cause an infinite loop in responds(to:).

Maybe it's better to check in responds(to:)? I don't know if there are other scenarios this could happen in.

Running UI Tests on Mac Catalyst

While working on the 2.0 update for Gathered I have been trying to develop the app multiple platforms simultaneously. SwiftUI will solve this problem in the future, but I wish to support some OS versions that SwiftUI does not support.

As part of this I have been creating UI tests to test performance, but ran in to an issue when running the UI tests on macOS using Mac Catalyst:

Running tests...
The bundle “PerformanceXCTests” couldn’t be loaded because it is damaged or missing necessary resources. Try reinstalling the bundle.
(dlopen_preflight(...): no suitable image found.  Did find:
	...: code signature in (...) not valid for use in process using Library Validation: mapped file has no Team ID and is not a platform binary (signed with custom identity or adhoc?))
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