Create new display rotation compat toast string for multi-window

To add more clarity and improve the user experience, introduce a new
toast string (to replace 'display_rotation_camera_compat_toast_in_split_screen')
which includes the app name so it's clear to the user which app to
relaunch in full screen.

Fix: 282782484
Fix: 267372967
Test: atest WmTests:DisplayRotationCompatPolicyTests

Change-Id: I07a0dc182ba46240449f2b12619c466f7484af06