When a task cacel fails, the exception should be explicitly thrown

fe/fe-core/src/main/java/org/apache/doris/job/task/AbstractTask.java

@@ -141,6 +141,7 @@ public void cancel() throws JobException {
             executeCancelLogic();
         } catch (Exception e) {
             log.warn("cancel task failed, job id is {}, task id is {}", jobId, taskId, e);
+            throw new JobException(e);
         } finally {
             closeOrReleaseResources();
         }