Ignore fragment attr from ext authenticator resource

Bug: 341886134
Test: Unit Test
Test: Manual - see ticket for steps
Flag: EXEMPT <security>
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:d43f82be7a1d2fc5659afeb9d7eca45bf4ba3a8e)
Merged-In: Id91c2b3b6d16ba3702ee2cd6723365a4db52863b
Change-Id: Id91c2b3b6d16ba3702ee2cd6723365a4db52863b
1 file changed