Merge "[Overview Sharing] Turn on the feature flag for overview sharing." into sc-dev am: 5354abb0e7

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14342901

Change-Id: Ic4dfe1c6b6b73cebbf12c56398afcbe94f951fe8