[automerger skipped] DO NOT MERGE - Disallow deletion of channels with FGS notifications am: 2a33098b am: 33b7a223 -s ours am: e17befe0 -s ours

am skip reason: subject contains skip directive

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/13533554

Change-Id: I6a18eb6bb5360eddb5f1459090bcab319cb085cb