Support a "System" toggle in CTS-Verifier. When it's enabled:

1. camera ITS test (both folded and unfolded) is filtered to be shown in the list.
2. the test_result.xml has the "verify-system" as the suite_plan's value.

More demos are in b/301678868.

Bug: 301678868
Test: local built CTS-V
Change-Id: Ic9c945a10e50f27de6c71716ff134bf68fdee359