Ignore test_bgp_prefix.py::test_bgp_prefix_tc1_suite for Cisco 8122 b…

…ackend compute ai deployment (#15622)

* init commit

* revise

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -735,6 +735,12 @@ generic_config_updater:
     conditions:
       - "'t2' in topo_name"
 
+generic_config_updater/test_bgp_prefix.py::test_bgp_prefix_tc1_suite[empty]:
+  skip:
+    reason: "Cisco 8122 backend compute ai platform is not supported."
+    conditions:
+      - "platform in ['x86_64-8122_64eh_o-r0', 'x86_64-8122_64ehf_o-r0']"
+
 generic_config_updater/test_dhcp_relay.py:
   skip:
     reason: "Need to skip for platform x86_64-8111_32eh_o-r0 or backend topology / generic_config_updater is not a supported feature for T2"