Improved AbstractMasterSystemService to handle supported user types.

Also changed AutofillManagerService and ContentCaptureManagerService to take advantage of these methods.

Test: manual verification
Test: atest CtsAutoFillServiceTestCases CtsContentCaptureServiceTestCases # on phone and Automotive

Bug: 133242016

Change-Id: I3e7f9d65a6ef1e8e6ec886a41b35733e463a6389