Migrate WindowContext#onConfigurationChanged to ClientTransaction (3/n)

Update the ImmersiveModeConfirmation: when needs to show in a different
DisplayArea, dismiss the existing WindowContext instead of updating the
options.

Bug: 277290737
Test: manually verify the confirmation is shown/dismissed as normal
Change-Id: I3647053c3da33d81f6b2a69cce1ab32346828cb3
Merged-In: I3647053c3da33d81f6b2a69cce1ab32346828cb3