Only clear inline suggestions when IMS.onInputFinish is called

* Don't clear inline suggestions when receiving VIEW_EXIT from
  Autofill session
* Don't clear inline suggestions when IME becomes invisible
  from IMS.onInputViewFinish(), instead only clear when
  IMS.onInputFinish() is called
* Don't clear inline suggestions when launching an intent from
  inline action chip (be it authentication intent or regular
  action)

Test: atest android.autofillservice.cts.inline
Bug: 156099633

Change-Id: I8bebec3135410131e12c62e37b8a63a3702f7fac