[PIP2] Hide PiP menu when PiP is moved or resized.

Recall: http://recall/clips/a108d098-fea6-4fb7-b5e5-5acf0b0392be

Bug: 322548939
Test: Launch PiP and manually verify menu is hidden when PiP is moved or
resized.
Flag: com.android.wm.shell.enable_pip2

Change-Id: I14b726e9c96a31822e3baf5a3f06b1c7d9462739