[AllApps][Work] Introduce work toggle Fab am: 08cca82eca am: 764fb3cb25 am: 515652f94d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14724697

Change-Id: Ie9ca5780b8ed7e3e83f93586aa5ecdd782d7f0cf