Projected mode: Do not alter internal display tasks on disconnect/reconnect.

Currently on disconnect, the globally focused task is moved to the top of the internal display for both projected and extended display modes. This CL instead moves all external display tasks to the bottom, leaving existing internal display tasks the same.

Similarly, on reconnect, we skip task restoration for taskIds that are currently focused on the internal display. If that means we restore no tasks, then we bypass restoreDisplay altogether.

Bug: 435443831
Test: Manual
Flag: com.android.window.flags.enable_display_disconnect_interaction
Flag: com.android.window.flags.enable_display_reconnect_interaction
Change-Id: Iaf463b9c62deadda9814e88ac84fe7a05412ecc0