[fix](delete) Fix potential delete job stuck util timeout if exceptio…

…n happend in FE DeleteJob execution (#41672)

## Proposed changes

Fail task should also count down for the count down latch to prevent job
stuck.

fe/fe-core/src/main/java/org/apache/doris/master/MasterImpl.java

@@ -423,6 +423,9 @@ private void finishRealtimePush(AgentTask task, TFinishTaskRequest request) thro
         } catch (MetaNotFoundException e) {
             AgentTaskQueue.removeTask(backendId, TTaskType.REALTIME_PUSH, signature);
             LOG.warn("finish push replica error", e);
+            if (pushTask.getPushType() == TPushType.DELETE) {
+                pushTask.countDownLatch(backendId, pushTabletId);
+            }
         } finally {
             olapTable.writeUnlock();
         }