[Autofill PCC] Avoid duplicates suggestions with prefer_pcc

Avoid the possibility of showing up duplicate suggestions with preferPCC.
If the dataset is being picked up because the type is detected by the PCC,
include other fields specified by the provider too (only if those autofill
id's aren't detected by the PCC)
This also removes empty datasets being created during processing.

Bug: 293313411
Fixes: 295184051
Test: atest CtsAutoFillServiceTestCases
Change-Id: I4a82d19350fe02ad5758682ba4d5535908a9a14a