Make autofill requested by augmented autofill service non-manual

* The use case of this API was for augmented autofill service to send
  updated suggestions
* Before this change, the dynamic autofill request by the augmented
  autofill service only triggers a manual request, but this has caused
  some regular autofill providers to always some suggestion due to
  their special handling for the manual request. Thus the augmented
  autofill service will not receive the request.
* With this cahnge, the request cancels the previous session to start a
  new session, and also it triggers a regular request (non-manual) so
  the autofill provider will not special handle the request.

Test: atest CtsAutoFillServiceTestCases
Bug: 154543563

Change-Id: I233125a6070394a102ad40b9a50b98a43d952b9f