Revert "Stop testing visionOS for the time being." #371

Job	Run time
pod-lib-lint (ios, Debug)	13m 37s
pod-lib-lint (ios, Release)	14m 8s
pod-lib-lint (macos, Debug)	8m 50s
pod-lib-lint (macos, Release)	9m 12s
pod-lib-lint (tvos, Debug)	9m 5s
pod-lib-lint (tvos, Release)	9m 51s
pod-lib-lint (visionos, Debug)	12m 2s
pod-lib-lint (visionos, Release)	12m 0s
pod-lib-lint (watchos --skip-tests, Debug)	53s
pod-lib-lint (watchos --skip-tests, Release)	1m 17s
	1h 30m 55s

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