feat(storage): allow the s3 list api to accept an optional bucket #3827

Job	Run time
test / test-flutter-vm (stable, any)	3m 19s
test / test-flutter-vm (stable, 3.19.0)	3m 25s
e2e_ios_test / e2e-test-ios (stable)	12m 9s
e2e_linux_test / e2e-test-linux (stable)	8m 32s
e2e_android_test / e2e-test-android (24, stable)	12m 51s
e2e_android_test / e2e-test-android (34, stable)	11m 50s
e2e_web_test / e2e-test-web (stable)	8m 12s
e2e_windows_test / e2e-test-windows (stable)	11m 3s
	1h 11m 21s

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