xfail flaky test script test_events.py for image issue (sonic-net#1…

…4161)

What is the motivation for this PR?
test_events.py is flaky in PR test, would block some PRs, the root cause should be image issue

How did you do it?
Create image issue sonic-net/sonic-buildimage#19943 and xfail test_events.py in PR test

.azure-pipelines/pr_test_scripts.yaml

@@ -172,8 +172,7 @@ t0:
   - tacacs/test_ro_disk.py
   - tacacs/test_ro_user.py
   - tacacs/test_rw_user.py
-  # Temporarily skip test_events due to test issue with high failure rate
-  # - telemetry/test_events.py
+  - telemetry/test_events.py
   - telemetry/test_telemetry.py
   - telemetry/test_telemetry_cert_rotation.py
   - test_features.py
@@ -394,6 +393,7 @@ t1-lag:
   - platform_tests/test_reload_config.py
   - hash/test_generic_hash.py
   - sub_port_interfaces/test_sub_port_interfaces.py
+  - telemetry/test_events.py
   - show_techsupport/test_auto_techsupport.py
 
 multi-asic-t1-lag:
@@ -472,7 +472,6 @@ onboarding_t1:
   - bgp/test_bgp_sentinel.py
   - bgp/test_bgp_suppress_fib.py
   - snmp/test_snmp_link_local.py
-  - telemetry/test_events.py
 
 onboarding_dualtor:
   - dualtor_io/test_link_failure.py

tests/common/plugins/conditional_mark/tests_mark_conditions.yaml

@@ -1714,6 +1714,11 @@ telemetry/test_events.py:
     reason: "Skip telemetry test events for 202211 and older branches"
     conditions:
       - "release in ['201811', '201911', '202012', '202205', '202211']"
+  xfail:
+    reason: "Test events is flaky in PR test, xfail until issue resolved"
+    conditions:
+      - "asic_type in ['vs']"
+      - https://github.com/sonic-net/sonic-buildimage/issues/19943
 
 telemetry/test_telemetry.py:
   skip: