RESTRICT AUTOMERGE Stops hiding a11y services with the same package+label as an activity.

Bug: 353700779
Test: Install poc APKs from the bug, observe issue not reproducible
Test: (automated tests on 'main' branch)
Flag: NONE security fix
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:5a47b3d2f04b96946fb72a2321bc0c42b25f9aea)
Merged-In: Ia8d43229d277dd4442173166ae0402f05096da4b
Change-Id: Ia8d43229d277dd4442173166ae0402f05096da4b