chore(core): add validation checks for AmplifyOutputs Json deserialization #2587

Job	Run time
test / test-flutter-vm (stable, any)	3m 18s
test / test-flutter-vm (stable, 3.19.0)	3m 31s
e2e_android_test / e2e-test-android (24, stable)	18m 39s
e2e_android_test / e2e-test-android (33, stable)	20m 18s
e2e_linux_test / e2e-test-linux (stable)	15m 24s
e2e_ios_test / e2e-test-ios (stable)	18m 43s
e2e_web_test / e2e-test-web (stable)	13m 30s
e2e_windows_test / e2e-test-windows (stable)	19m 38s
	1h 53m 1s

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