feat(storage): allow the s3 list api to accept an optional bucket #3965

Job	Run time
test / test-flutter-vm (stable, any)	3m 27s
test / test-flutter-vm (stable, 3.19.0)	3m 33s
e2e_ios_test / e2e-test-ios (stable)	38m 8s
e2e_android_test / e2e-test-android (24, stable)	39m 48s
e2e_web_test / e2e-test-web (stable)	42m 55s
e2e_android_test / e2e-test-android (34, stable)	31m 37s
e2e_linux_test / e2e-test-linux (stable)	36m 51s
e2e_windows_test / e2e-test-windows (stable)	44m 13s
	4h 0m 32s

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