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Add `#Preview` and `@Test` traits for overriding dependencies #648

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Run time

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Job	Run time
Ubuntu (Swift 5.10)	43s
macOS (debug, 15.4)	57s
macOS (debug, 16_beta_6)	59s
macOS (release, 15.4)	55s
macOS (release, 16_beta_6)	1s
	3m 35s