caching & cleanup #1346

Job	Run time
cancel_previous	5s
run-e2e-ios (ios-latest, iPhone 17, 26.1)	1m 26s
run-e2e-android (android-latest, medium_phone_API33_x86_64, start-android-latest)	6m 50s
run-e2e-ios (ios-min, iPhone 14, 18.5)	1m 11s
run-e2e-android (android-min, pixel_API21_x86_64, start-android-minsdk)	6m 56s
build-and-test	9m 3s
	25m 31s

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