[Settings] Additional route for dismiss activity dialog

Previous design dismiss an activity dialog through Intent would lead to a pair of creating and finishing activity. The task switch during the creating and finishing may introduce some side effect to the other apps.

This change tried to add additional route to avoid from dismiss through Intent
but sending an async close request to that specific dialog (if available).

Bug: 236956105
Test: local, auto testing
Merged-In: I7a912a3393694155d29614d325796e08598985bf
Merged-In: I0a7e0e9826a301f2aa0ca34f40b5570f0e384b4f
Change-Id: I88a6c0632c1be906b310a10c154149c319d34759