ref(deletes): remove sentry warning (#7698)

Author: MeredithAnya

snuba/lw_deletions/strategy.py

@@ -95,11 +95,10 @@ def submit(self, message: Message[ValuesBatch[KafkaPayload]]) -> None:
                 self._execute_delete(conditions)
             else:
                 self.__metrics.increment("delete_skipped")
-        except TooManyOngoingMutationsError as err:
+        except TooManyOngoingMutationsError:
             # backpressure is applied while we wait for the
             # currently ongoing mutations to finish
             self.__metrics.increment("too_many_ongoing_mutations")
-            logger.warning(str(err), exc_info=True)
             raise MessageRejected
         except QueryException as err:
             cause = err.__cause__