Skip testcase on M0/Mx (#10102)

What is the motivation for this PR?
Skip below testcases on M0/Mx topology:
- bgp/test_bgp_queue.py
- generic_config_updater/test_pg_headroom_update.py

How did you do it?
Updated conditional mark file.

How did you verify/test it?
Verified on Mx testbed.

Signed-off-by: Zhijian Li <zhijianli@microsoft.com>

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -101,6 +101,12 @@ bgp/test_bgp_multipath_relax.py:
     conditions:
       - "'backend' in topo_name"
 
+bgp/test_bgp_queue.py:
+  skip:
+    reason: "Unsupported topology"
+    conditions:
+      - "topo_type in ['m0', 'mx']"
+
 bgp/test_bgp_slb.py:
   skip:
     reason: "Skip over topologies which doesn't support slb."
@@ -526,6 +532,12 @@ generic_config_updater/test_pfcwd_status.py:
     conditions:
       - "topo_type in ['m0', 'mx']"
 
+generic_config_updater/test_pg_headroom_update.py:
+  skip:
+    reason: "Unsupported topology."
+    conditions:
+      - "topo_type in ['m0', 'mx']"
+
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