[VS test] Skip flaky virtual chassis test (sonic-net#2004)

*skip test_virtual_chassis.py tests for lag_id

Author: prsunny

tests/test_virtual_chassis.py

@@ -607,6 +607,7 @@ def test_chassis_system_lag(self, vct):
 
                     break
 
+    @pytest.mark.skip(reason="This test is not stable enough")
     def test_chassis_system_lag_id_allocator_table_full(self, vct):
         """Test lag id allocator table full.
         
@@ -684,6 +685,7 @@ def test_chassis_system_lag_id_allocator_table_full(self, vct):
 
                     break
 
+    @pytest.mark.skip(reason="This test is not stable enough")
     def test_chassis_system_lag_id_allocator_del_id(self, vct):
         """Test lag id allocator's release id and re-use id processing.