[Ci] Support the SONiC reproducible build in Azure Pipelines (#13986)

Why I did it
[Ci] Support the SONiC reproducible build in Azure Pipelines
Enable the reproducible build on master branch
Enable the mirror snapshot based build on 202205+ which support snapshot build.

How I did it
Enable the build flag on Azure Pipelines.

How to verify it

.azure-pipelines/azure-pipelines-repd-build-variables.yml

@@ -1,7 +1,5 @@
 variables:
   ${{ if eq(variables['Build.Reason'],'PullRequest') }}:
     VERSION_CONTROL_OPTIONS: 'SONIC_VERSION_CONTROL_COMPONENTS=$([[ "$(System.PullRequest.TargetBranch)" =~ ^20[2-9][0-9]{3}$ ]] && echo deb,py2,py3,web,git,docker)'
-  ${{ elseif ne(variables['Build.SourceBranchName'],'master') }}:
-    VERSION_CONTROL_OPTIONS: 'SONIC_VERSION_CONTROL_COMPONENTS=deb,py2,py3,web,git,docker'
   ${{ else }}:
-    VERSION_CONTROL_OPTIONS: ''
+    VERSION_CONTROL_OPTIONS: 'SONIC_VERSION_CONTROL_COMPONENTS=deb,py2,py3,web,git,docker'

.azure-pipelines/template-variables.yml

@@ -6,3 +6,4 @@ variables:
   SONIC_BUILD_RETRY_INTERVAL: 600
   DOCKER_BUILDKIT: 0
   DOCKER_BUILD_TIMEOUT: 3600
+  MIRROR_SNAPSHOT: y

.github/workflows/label.yml

@@ -12,6 +12,7 @@ on:
     - opened
     - reopened
     branches:
+    - master
     - '202012'
     - '202[1-9][0-9][0-9]'
     - '20[3-9][0-9][0-9][0-9]'