caching & cleanup #1356

Job	Run time
run-e2e-ios (ios-latest, iPhone 17, 26.1)	54s
cancel_previous	5s
run-e2e-ios (ios-min, iPhone 14, 18.5)	1m 13s
run-e2e-android (android-latest, medium_phone_API33_x86_64, start-android-latest)	7m 8s
run-e2e-android (android-min, pixel_API21_x86_64, start-android-minsdk)	6m 45s
build-and-test	9m 29s
	25m 34s

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