[Bug][Api] Complete Data workflow remove duplicates. (#10868)

Co-authored-by: houshitao <shitaohou@163.com>

dolphinscheduler-api/src/main/java/org/apache/dolphinscheduler/api/service/impl/ExecutorServiceImpl.java

@@ -986,7 +986,8 @@ public class ExecutorServiceImpl extends BaseServiceImpl implements ExecutorServ
      */
     private String removeDuplicates(String scheduleTimeList) {
         if (StringUtils.isNotEmpty(scheduleTimeList)) {
-            return Arrays.stream(scheduleTimeList.split(COMMA)).map(String::trim).collect(Collectors.joining(COMMA));
+            Set<String> dateSet  = Arrays.stream(scheduleTimeList.split(COMMA)).map(String::trim).collect(Collectors.toSet());
+            return String.join(COMMA, dateSet);
         }
         return null;
     }