feat(storage): allow the s3 list api to accept an optional bucket #3759

Job	Run time
test / test-flutter-vm (stable, any)	3m 29s
test / test-flutter-vm (stable, 3.19.0)	3m 36s
e2e_ios_test / e2e-test-ios (stable)	1h 5m 39s
e2e_linux_test / e2e-test-linux (stable)	8m 21s
e2e_android_test / e2e-test-android (24, stable)	12m 37s
e2e_android_test / e2e-test-android (34, stable)	13m 18s
e2e_web_test / e2e-test-web (stable)	9m 41s
e2e_windows_test / e2e-test-windows (stable)	12m 29s
	2h 9m 10s

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