[PiP on CD] Use DisplayIdListener to update PiP UI dimensions

when the display id changes in PipDisplayLayoutState.

Recall: http://recall/clips/82162650-bb7c-4cc1-9347-86889786f16e

Bug: 416788659
Bug: 417466276
Test: atest WMShellUnitTests:com.android.wm.shell.pip2
Test: atest WMShellUnitTests:com.android.wm.shell.pip
Test: atest WMShellUnitTests:com.android.wm.shell.common.pip
Test: Manual - verify on external display (2k monitor and Nexdock) that
PiP UI is scaled appropriately
Flag: com.android.window.flags.enable_connected_displays_pip

Change-Id: I1aa0c261dfce63542e8e628bf4843edaaf92e679