Treat eligibility changes as potential disconnect/reconnect.

When a display becomes desktop ineligible, treat it as though it has
disconnected. Similarly, when a display becomes desktop eligible, treat
it as though is has potentially reconnected.

Bug: 424053840
Test: Manual; end mirroring, observe no crash or reduced functionality
Flag: com.android.window.flags.enable_display_disconnect_interaction
Flag: com.android.window.flags.enable_display_reconnect_interaction

Change-Id: Id9acf107db3234d69fecb775012cc9ab367b3ba3