Update skip list due to github issue sonic-net#15387 (sonic-net#15421)

- What is the motivation for this PR?
Add xfail and skip for case test_pfcwd_actions due to github issues 15387

- How did you do it?
Add and update skip condition list

- How did you verify/test it?
Run it in internal regression

Change-Id: I534291af6176c7390ac5240820e42f3106a44b02

Author: echuawu

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -1482,6 +1482,12 @@ pfcwd/test_pfcwd_all_port_storm.py:
       - "hwsku in ['Arista-7060X6-64PE-256x200G']"
       - "topo_type in ['m0', 'mx']"
 
+pfcwd/test_pfcwd_function.py::TestPfcwdFunc::test_pfcwd_actions:
+  xfail:
+    reason: "On Dualtor AA setup, test_pfcwd_actions is not stable due to github issue https://github.com/sonic-net/sonic-mgmt/issues/15387"
+    conditions:
+      - "'dualtor-aa' in topo_name and https://github.com/sonic-net/sonic-mgmt/issues/15387"
+
 pfcwd/test_pfcwd_function.py::TestPfcwdFunc::test_pfcwd_no_traffic:
    skip:
      reason: "This test is applicable only for cisco-8000 / Pfcwd tests skipped on m0/mx testbed."