chore(flagpole): Adds metrics to batch_has checks (#74328)

Adds metric gathering to `batch_has` entity handler checks to begin
gathering flagpole performance information.

src/sentry/features/manager.py

@@ -328,9 +328,11 @@ def batch_has(
  OrganizationFeatures.
  """
  if self._entity_handler:
- return self._entity_handler.batch_has(
- feature_names, actor, projects=projects, organization=organization
- )
+ with metrics.timer("features.entity_batch_has", sample_rate=0.01):
+ return self._entity_handler.batch_has(
+ feature_names, actor, projects=projects, organization=organization
+ )
+
  else:
  # Fall back to default handler if no entity handler available.
  project_features = [name for name in feature_names if name.startswith("projects:")]