[TestbedV2] Add wan topo test using TestbedV2. (sonic-net#12751)

Add wan topo test using TestbedV2.

Why I did it
Add wan topo test using TestbedV2.

How I did it
Add a job to run wan topo in pr test.

Signed-off-by: Yutong Zhang <yutongzhang@microsoft.com>

azure-pipelines.yml

@@ -365,3 +365,18 @@ stages:
           COMMON_EXTRA_PARAMS: "--neighbor_type=sonic --enable_macsec --macsec_profile=128_SCI,256_XPN_SCI"
           VM_TYPE: vsonic
           SPECIFIED_PARAMS: '{\"test_pretest.py\":[\"--completeness_level=confident\",\"--allow_recover\"],\"test_posttest.py\":[\"--completeness_level=confident\",\"--allow_recover\"]}'
+
+  - job: wan_testbedv2
+    displayName: "kvmtest-wan by TestbedV2"
+    pool:
+      vmImage: 'ubuntu-20.04'
+    timeoutInMinutes: 1080
+    condition: and(succeeded(), eq(variables.BUILD_IMG_RUN_TESTBEDV2_TEST, 'YES'))
+    continueOnError: true
+    steps:
+      - template: .azure-pipelines/run-test-scheduler-template.yml
+        parameters:
+          TOPOLOGY: wan-pub
+          MIN_WORKER: 1
+          MAX_WORKER: 1
+          COMMON_EXTRA_PARAMS: "--skip_sanity "