Extend/shrink work button when scrolling

most of the change was from this CL: ag/19223926
moved scroll listener definition to WorkProfileManager.java
Added feature flag

bug: 194188980
test: Video - https://drive.google.com/file/d/18UM7UDNQz-Z8Q2Sh8VEKHm9LXRVJaWFM/view?usp=sharing
Change-Id: Ib80784e0f5108b28658141ca5e495a27fab34a3c