add gcp batch feature flag

Signed-off-by: Javan Lacerda <javanlacerda@google.com>

Author: javanlacerda

src/clusterfuzz/_internal/base/feature_flags.py

@@ -31,6 +31,8 @@ class FeatureFlags(Enum):
 
   UTASK_MAIN_QUEUE_LIMIT = 'utask_main_queue_limit'
 
+  GCP_BATCH_JOBS_FREQUENCY = 'gcp_batch_jobs_frequency'
+
   @property
   def flag(self):
     """Get the feature flag."""

src/clusterfuzz/_internal/remote_task/remote_task_adapters.py

@@ -35,7 +35,8 @@ class RemoteTaskAdapters(Enum):
   """
   KUBERNETES = ('kubernetes', k8s_service.KubernetesService,
                 feature_flags.FeatureFlags.K8S_JOBS_FREQUENCY, 0.0)
-  GCP_BATCH = ('gcp_batch', batch_service.GcpBatchService, None, 1.0)
+  GCP_BATCH = ('gcp_batch', batch_service.GcpBatchService,
+               feature_flags.FeatureFlags.GCP_BATCH_JOBS_FREQUENCY, 1.0)
 
   def __init__(self, adapter_id, service, feature_flag, default_weight):
     self.id = adapter_id