DIR_METADATA: Add V2 Test Plans.

Add the default set of test rules.

V2 test plans will be verified in staging before being enabled in prod.

See go/cros-cq-test-config for more details.

BUG=b:249150178
TEST=dirmd validate

Change-Id: I4f4b27303e50366483d6e0659d8e883303275ab0