chore: Remove obsolete creating missing metric permissions (#11143)

superset/security/manager.py

@@ -551,7 +551,6 @@ def create_missing_perms(self) -> None:
         Creates missing FAB permissions for datasources, schemas and metrics.
         """
 
-        from superset.connectors.base.models import BaseMetric
         from superset.models import core as models
 
         logger.info("Fetching a set of all perms to lookup which ones are missing")
@@ -576,11 +575,6 @@ def merge_pv(view_menu: str, perm: str) -> None:
         for database in databases:
             merge_pv("database_access", database.perm)
 
-        logger.info("Creating missing metrics permissions")
-        metrics: List[BaseMetric] = []
-        for datasource_class in ConnectorRegistry.sources.values():
-            metrics += list(self.get_session.query(datasource_class.metric_class).all())
-
     def clean_perms(self) -> None:
         """
         Clean up the FAB faulty permissions.