Enum to determine if service usage should be checked when
disabling a service.
Values:
CHECK_IF_SERVICE_HAS_USAGE_UNSPECIFIED (0):
When unset, the default behavior is used,
which is SKIP.
SKIP (1):
If set, skip checking service usage when
disabling a service.
CHECK (2):
If set, service usage is checked when disabling the service.
If a service, or its dependents, has usage in the last 30
days, the request returns a FAILED_PRECONDITION error.
