[MINOR] fix: flaky test ShuffleTaskManagerTest#checkAndClearLeakShuff…

…leDataTest (#1320)

### What changes were proposed in this pull request?
fix flaky test ShuffleTaskManagerTest#checkAndClearLeakShuffleDataTest.

### Why are the changes needed?
ShuffleTaskManagerTest.checkAndClearLeakShuffleDataTest:940 expected:
<false> but was: <true>

The cause of the problem:
Application in shuffleTaskInfos is removed first, and then remove the directory in the local disk.
Refer: org.apache.uniffle.server.ShuffleTaskManager#removeResources

### Does this PR introduce any user-facing change?
No.

### How was this patch tested?
Repeat it for 100 times in my development enviroment.

(cherry picked from commit e1a5499)

server/src/test/java/org/apache/uniffle/server/ShuffleTaskManagerTest.java

@@ -936,8 +936,9 @@ public void checkAndClearLeakShuffleDataTest(@TempDir File tempDir) throws Excep
     File hiddenFile = new File(storageDir + "/" + LocalStorageChecker.CHECKER_DIR_NAME);
     hiddenFile.mkdir();
 
-    appIdsOnDisk = getAppIdsOnDisk(localStorageManager);
-    assertFalse(appIdsOnDisk.contains(appId));
+    Awaitility.await()
+        .timeout(10, TimeUnit.SECONDS)
+        .until(() -> !getAppIdsOnDisk(localStorageManager).contains(appId));
     assertFalse(appIdsOnDisk.contains(LocalStorageChecker.CHECKER_DIR_NAME));
 
     // mock leak shuffle data