Re-enable disabled PIT integration tests (opensearch-project#3871)

### Description

Re-enables 2 PIT integration tests that were previously disabled. This
adds a @before method to clean up all PITs created from previous test
cases to ensure each test case runs pristinely.

* Category (Enhancement, New feature, Bug fix, Test fix, Refactoring,
Maintenance, Documentation)

Test fix

### Issues Resolved

- opensearch-project#3424

Is this a backport? If so, please add backport PR # and/or commits #

### Testing
[Please provide details of testing done: unit testing, integration
testing and manual testing]

### Check List
- [ ] New functionality includes testing
- [ ] New functionality has been documented
- [ ] Commits are signed per the DCO using --signoff

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.
For more information on following Developer Certificate of Origin and
signing off your commits, please check
[here](https://github.com/opensearch-project/OpenSearch/blob/main/CONTRIBUTING.md#developer-certificate-of-origin).

---------

Signed-off-by: Craig Perkins <cwperx@amazon.com>

src/integrationTest/java/org/opensearch/security/PointInTimeOperationTest.java

@@ -14,13 +14,12 @@
 import com.carrotsearch.randomizedtesting.RandomizedRunner;
 import com.carrotsearch.randomizedtesting.annotations.ThreadLeakScope;
 import org.apache.commons.lang3.tuple.Pair;
+import org.junit.Before;
 import org.junit.BeforeClass;
 import org.junit.ClassRule;
-import org.junit.Ignore;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
-import org.opensearch.OpenSearchStatusException;
 import org.opensearch.action.admin.indices.alias.IndicesAliasesRequest;
 import org.opensearch.action.index.IndexRequest;
 import org.opensearch.action.search.CreatePitRequest;
@@ -33,7 +32,6 @@
 import org.opensearch.client.Client;
 import org.opensearch.client.RestHighLevelClient;
 import org.opensearch.common.unit.TimeValue;
-import org.opensearch.core.rest.RestStatus;
 import org.opensearch.search.builder.PointInTimeBuilder;
 import org.opensearch.search.builder.SearchSourceBuilder;
 import org.opensearch.test.framework.TestSecurityConfig;
@@ -133,6 +131,13 @@ public static void createTestData() {
         }
     }
 
+    @Before
+    public void cleanUpPits() throws IOException {
+        try (RestHighLevelClient restHighLevelClient = cluster.getRestHighLevelClient(ADMIN_USER)) {
+            restHighLevelClient.deleteAllPits(DEFAULT);
+        }
+    }
+
     @ClassRule
     public static final LocalCluster cluster = new LocalCluster.Builder().clusterManager(ClusterManager.THREE_CLUSTER_MANAGERS)
         .anonymousAuth(false)
@@ -180,11 +185,9 @@ public void createPitWithIndexAlias_negative() throws IOException {
         }
     }
 
-    @Ignore("Pretty sure cleanUpPits is returning before all of the PITs have actually been deleted")
     @Test
     public void listAllPits_positive() throws IOException {
         try (RestHighLevelClient restHighLevelClient = cluster.getRestHighLevelClient(POINT_IN_TIME_USER)) {
-            cleanUpPits();
             String firstIndexPit = createPitForIndices(FIRST_SONG_INDEX);
             String secondIndexPit = createPitForIndices(SECOND_SONG_INDEX);
 
@@ -247,11 +250,9 @@ public void deletePitCreatedWithIndexAlias_negative() throws IOException {
         }
     }
 
-    @Ignore("Pretty sure cleanUpPits is returning before all of the PITs have actually been deleted")
     @Test
     public void deleteAllPits_positive() throws IOException {
         try (RestHighLevelClient restHighLevelClient = cluster.getRestHighLevelClient(POINT_IN_TIME_USER)) {
-            cleanUpPits();
             String firstIndexPit = createPitForIndices(FIRST_SONG_INDEX);
             String secondIndexPit = createPitForIndices(SECOND_SONG_INDEX);
 
@@ -410,20 +411,4 @@ private String createPitForIndices(String... indices) throws IOException {
         }
     }
 
-    /**
-    * Deletes all PITs.
-    */
-    public void cleanUpPits() throws IOException {
-        try (RestHighLevelClient restHighLevelClient = cluster.getRestHighLevelClient(ADMIN_USER)) {
-            try {
-                restHighLevelClient.deleteAllPits(DEFAULT);
-            } catch (OpenSearchStatusException ex) {
-                if (ex.status() != RestStatus.NOT_FOUND) {
-                    throw ex;
-                }
-                // tried to remove pits but no pit exists
-            }
-        }
-    }
-
 }