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: Ie9d40020bb793a66a9ce426e932b92276df9d694