[BUG] #15013 Fix retryInterval in RetryPolicy will never be used in RetryUtils (#15014)

* Update RetryUtils.java

assigned

* UT

* Update RetryUtilsTest.java

---------

Co-authored-by: xiangzihao <460888207@qq.com>
Co-authored-by: Rick Cheng <rickchengx@gmail.com>

dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/main/java/org/apache/dolphinscheduler/plugin/task/api/utils/RetryUtils.java

@@ -41,7 +41,7 @@ public class RetryUtils {
      */
     public static <T> T retryFunction(@NonNull Supplier<T> supplier, @NonNull RetryPolicy retryPolicy) {
         int retryCount = 0;
-        long retryInterval = 0L;
+        long retryInterval = retryPolicy.getRetryInterval();
         while (true) {
             try {
                 return supplier.get();

dolphinscheduler-task-plugin/dolphinscheduler-task-api/src/test/java/org/apache/dolphinscheduler/plugin/task/api/utils/RetryUtilsTest.java

@@ -37,6 +37,13 @@ public class RetryUtilsTest {
             Assertions.fail();
         });
 
+        long startTime = System.currentTimeMillis();
+        Assertions.assertThrows(RuntimeException.class, () -> RetryUtils.retryFunction((Supplier<Boolean>) () -> {
+            throw new RuntimeException("Test failed function");
+        }, new RetryUtils.RetryPolicy(3, 1000L)));
+        long endTime = System.currentTimeMillis();
+        long elapsedTime = endTime - startTime;
+        Assertions.assertTrue(elapsedTime >= 3000L && elapsedTime < 4000L);
     }
 
 }