[4/N] Restore desks on display reconnect.

When a display preserved in DesktopRepository is reconnected, restore the desk to the display, adding tasks from the previously active desk with the bounds they had on disconnect.

Additionally, adds more logging and densityDpi changes to both
disconnect and reconnect.

Bug: 365873835
Test: Disconnect a display with desks, then reconnect it
Flag: com.android.window.flags.enable_display_disconnect_interaction
Flag: com.android.window.flags.enable_display_reconnect_interaction

Change-Id: Id0bde38ede08c574b41dd5314da4332d8dea23c1