Merge "Removing support for change listeners from feature flags" into sc-v2-dev am: 4aac62110e am: fdbabc6be4

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15302089

Change-Id: I9bb74727ab64325944f2d01e4fcc7aebfda144fd