refactor: Moving get_user_datasources to security manager (#15467)

Co-authored-by: John Bodley <john.bodley@airbnb.com>

superset/views/chart/views.py

@@ -21,8 +21,7 @@ from flask_appbuilder import expose, has_access
 from flask_appbuilder.models.sqla.interface import SQLAInterface
 from flask_babel import lazy_gettext as _
 
-from superset import db, is_feature_enabled
-from superset.connectors.connector_registry import ConnectorRegistry
+from superset import is_feature_enabled, security_manager
 from superset.constants import MODEL_VIEW_RW_METHOD_PERMISSION_MAP, RouteMethod
 from superset.models.slice import Slice
 from superset.typing import FlaskResponse
@@ -65,7 +64,7 @@ class SliceModelView(
     def add(self) -> FlaskResponse:
         datasources = [
             {"value": str(d.id) + "__" + d.type, "label": repr(d)}
-            for d in ConnectorRegistry.get_user_datasources(db.session)
+            for d in security_manager.get_user_datasources()
         ]
         payload = {
             "datasources": sorted(