chore: log multiple errors (#14064)

* log all errors from db create

* return unique set of errors

* sort set for exceptions list

* run black

superset/databases/commands/create.py

@@ -92,6 +92,9 @@ class CreateDatabaseCommand(BaseCommand):
             exception = DatabaseInvalidError()
             exception.add_list(exceptions)
             event_logger.log_with_context(
-                action=f"db_connection_failed.{exception.__class__.__name__}"
+                action="db_connection_failed.{}.{}".format(
+                    exception.__class__.__name__,
+                    ".".join(exception.get_list_classnames()),
+                )
             )
             raise exception