[MINOR] Minor fixes to exception log and removing unwanted metrics flush in integ test (#5646)

hudi-integ-test/src/main/java/org/apache/hudi/integ/testsuite/dag/scheduler/DagScheduler.java

@@ -117,9 +117,6 @@ public class DagScheduler {
       if (curRound < workflowDag.getRounds()) {
         new DelayNode(workflowDag.getIntermittentDelayMins()).execute(executionContext, curRound);
       }
-
-      // After each level, report and flush the metrics
-      Metrics.flush();
     } while (curRound++ < workflowDag.getRounds());
     log.info("Finished workloads");
   }

hudi-utilities/src/main/java/org/apache/hudi/utilities/deltastreamer/DeltaSync.java

@@ -846,7 +846,7 @@ public class DeltaSync implements Serializable {
       }
       return newWriteSchema;
     } catch (Exception e) {
-      throw new HoodieException("Failed to fetch schema from table.");
+      throw new HoodieException("Failed to fetch schema from table ", e);
     }
   }