Remove package certificate from ContactsIndexerTests

- Refactor ContactsIndexerConfig into an interface and add a test
  implementation that returns only default values which can be used for
  tests that don't need the READ_DEVICE_CONFIG permission.
- Remove INTERACT_ACROSS_USERS_FULL and READ_DEVICE_CONFIG permissions
  since they are privileged.
- Remove the platform certificate since this is not allowed in MTS.
- Move the tests to the general-tests suite now that the issues making
  it device-specific are resolved.

Bug: 203690505
Bug: 229203989
Test: ContactsIndexerTests
Change-Id: Idd171751580a21128b9c2986e8784ca340af06d3
15 files changed