Implement signOut for BYO-CIAM firebaseToken #16064

Job	Run time
Test Auth on Webkit if Changed	3m 18s
Test Auth on Firefox If Changed	4m 5s
Test Auth on Chrome and Node If Changed	3m 33s
Test Auth on Chrome and Node If Changed	3m 25s
Test Auth on Firefox If Changed	4m 5s
Test Auth on Webkit if Changed	3m 18s
Test Auth on Chrome and Node If Changed	3m 41s
Test Auth on Webkit if Changed	3m 18s
Test Auth on Firefox If Changed	4m 5s
Test Auth on Chrome and Node If Changed	3m 30s
Test Auth on Firefox If Changed	4m 5s
Test Auth on Webkit if Changed	3m 18s
	43m 41s

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