[fix][ci] Move flaky asyncMarkDeleteBlocking tests to flaky group (#25096)

Author: lhotari

managed-ledger/src/test/java/org/apache/bookkeeper/mledger/impl/ManagedCursorTest.java

@@ -1350,7 +1350,7 @@ void cursorPersistence2() throws Exception {
         assertEquals(c4.getMarkDeletedPosition(), p1);
     }
 
-    @Test
+    @Test(groups = "flaky")
     public void asyncMarkDeleteBlocking() throws Exception {
         ManagedLedgerConfig config = new ManagedLedgerConfig();
         config.setMaxEntriesPerLedger(10);
@@ -4509,7 +4509,7 @@ public void testLazyCursorLedgerCreation() throws Exception {
         ledger.close();
     }
 
-    @Test
+    @Test(groups = "flaky")
     public void testLazyCursorLedgerCreationForSubscriptionCreation() throws Exception {
         ManagedLedgerConfig managedLedgerConfig = new ManagedLedgerConfig();
         ManagedLedgerImpl ledger =

managed-ledger/src/test/java/org/apache/bookkeeper/mledger/impl/NonDurableCursorTest.java

@@ -532,7 +532,7 @@ void markDeleteSkippingMessage() throws Exception {
         assertEquals(cursor.getReadPosition(), PositionFactory.create(p4.getLedgerId(), p4.getEntryId() + 1));
     }
 
-    @Test(timeOut = 20000)
+    @Test(timeOut = 20000, groups = "flaky")
     public void asyncMarkDeleteBlocking() throws Exception {
         ManagedLedgerConfig config = new ManagedLedgerConfig();
         config.setMaxEntriesPerLedger(10);