feat(core): update storage outputs class for multi-bucket support #3753

Job	Run time
test / test-flutter-vm (stable, any)	3m 27s
test / test-flutter-vm (stable, 3.19.0)	3m 35s
e2e_android_test / e2e-test-android (24, stable)	32m 30s
e2e_ios_test / e2e-test-ios (stable)	38m 42s
e2e_android_test / e2e-test-android (34, stable)	32m 30s
e2e_linux_test / e2e-test-linux (stable)	38m 46s
e2e_web_test / e2e-test-web (stable)	43m 24s
e2e_windows_test / e2e-test-windows (stable)	43m 51s
	3h 56m 45s

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