[ci] Support to skip vstest using include/exclude config file. (sonic-net#11086)

example:
├── folderA
│  ├──  fileA (skip vstest)
│  ├──  fileB
│  └──  fileC
If we want to skip vstest when changing /folderA/fileA, and not skip vstest when changing fileB or fileC.

vstest-include:
^folderA/fileA

vstest-exclude:
^folderA

Author: liushilongbuaa

.azure-pipelines/azure-pipelines-build.yml

@@ -98,6 +98,7 @@ jobs:
             platform_rpc: nephos
 
     buildSteps:
+      - template: template-skipvstest.yml
       - bash: |
           set -ex
           if [ $(GROUP_NAME) == vs ]; then

.azure-pipelines/template-skipvstest.yml

@@ -0,0 +1,12 @@
+steps:
+- ${{ if eq(variables['Build.Reason'], 'PullRequest') }}:
+  - script: |
+      set -ex
+      tar_branch=origin/$(System.PullRequest.TargetBranch)
+      git diff $tar_branch..HEAD --name-only | grep -v -f .azure-pipelines/vstest-exclude && exit 0
+      git diff $tar_branch..HEAD --name-only | grep -f .azure-pipelines/vstest-include && exit 0
+      set +x
+      echo "Skip vstest jobs"
+      echo "##vso[task.setvariable variable=SKIP_VSTEST;isOutput=true]YES"
+    name: SetVar
+    displayName: "Check if vstest is needed."

.azure-pipelines/vstest-exclude

@@ -0,0 +1,3 @@
+^platform
+^.azure-pipelines
+^files/build/versions

.azure-pipelines/vstest-include

@@ -0,0 +1,2 @@
+^platform/vs
+^.azure-pipelines/run-test-template.yml

azure-pipelines.yml

@@ -77,6 +77,7 @@ stages:
 
 - stage: Test
   dependsOn: BuildVS
+  condition: and(ne(stageDependencies.BuildVS.outputs['vs.SetVar.SKIP_VSTEST'], 'YES'), succeeded())
   variables:
   - name: inventory
     value: veos_vtb