Fix: #3876 Update task utils: removeIterationFromTaskRefName

Parsing name is not considering task ref name with double underscores

- This is not fully fixing the use of this function. There needs to be some kind of validation against the user from setting up the taskRefName with double underscore

common/src/main/java/com/netflix/conductor/common/utils/TaskUtils.java

@@ -26,6 +26,10 @@ public static String getLoopOverTaskRefNameSuffix(int iteration) {
 
     public static String removeIterationFromTaskRefName(String referenceTaskName) {
         String[] tokens = referenceTaskName.split(TaskUtils.LOOP_TASK_DELIMITER);
-        return tokens.length > 0 ? tokens[0] : referenceTaskName;
+        int length = tokens.length;
+        return length > 1 ? String.join(
+                TaskUtils.LOOP_TASK_DELIMITER,
+                Arrays.copyOf(tokens, length - 1)
+        ) : referenceTaskName;
     }
 }