Remove gnmi cases temporarily in PR test. (#12499)

Due to the image change #16957, it will cause failure of gnmi cases. And it will block all the test stage of buildimage. So remove the cases under the folder gnmi temporarily to unblock the pipeline. After fixing the issue caused by #16957, we will add the test cases back.

Author: yutongzhang-microsoft

.azure-pipelines/pr_test_scripts.yaml

@@ -56,9 +56,10 @@ t0:
   - generic_config_updater/test_portchannel_interface.py
   - generic_config_updater/test_syslog.py
   - generic_config_updater/test_vlan_interface.py
-  - gnmi/test_gnmi.py
-  - gnmi/test_gnmi_appldb.py
-  - gnmi/test_gnmi_configdb.py
+  # Temporarily remove these cases because of PR https://github.com/sonic-net/sonic-buildimage/pull/16957
+  # - gnmi/test_gnmi.py
+  # - gnmi/test_gnmi_appldb.py
+  # - gnmi/test_gnmi_configdb.py
   - http/test_http_copy.py
   - iface_loopback_action/test_iface_loopback_action.py
   - iface_namingmode/test_iface_namingmode.py