Merge "Adds a removeChangeListener to FeatureFlags$BooleanFlag." into sc-dev am: a9cb2fb476

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13700168

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I00d2769059cfae7e0b68ca1c6e28578386a5f88c