Skip dualtor_io/test_tor_bgp_failure.py (#16449)

What is the motivation for this PR?
The script dualtor_io/test_tor_bgp_failure.py has recently been failing frequently on the KVM testbed. This issue is being tracked in #16448. As a temporary measure, we have applied a conditional mark to skip this test in PR checks.

How did you do it?
As a temporary measure, we have applied a conditional mark to skip this test in PR checks.

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -658,6 +658,12 @@ dualtor_io/test_normal_op.py:
     conditions:
       - "asic_type in ['vs']"
 
+dualtor_io/test_tor_bgp_failure.py:
+  skip:
+    reason: "Skip on kvm due to an issue."
+    conditions:
+      - "asic_type in ['vs'] and https://github.com/sonic-net/sonic-mgmt/issues/16448"
+
 dualtor_io/test_tor_failure.py:
   skip:
     reason: "This script would toggle PDU, which is not supported on KVM."