Don't register NLS in test

NLS method calls due to being registered caused flakey behavior in test
runs

Flag: TEST_ONLY
Bug: 333142469
Test: atest SensitiveContentProtectionManagerServiceNotificationTest --iterations 50
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:30781abdf381f0fa455c56e2815b5ff53f183136)
Merged-In: Id19eb4a50008640e9a7ca556fd332f3fca8688ba
Change-Id: Id19eb4a50008640e9a7ca556fd332f3fca8688ba