[CI] Skip the insertions when not needed in the unified pipeline. (#17455)

tools/devops/automation/templates/main-stage.yml

@@ -52,6 +52,10 @@ parameters:
   type: boolean
   default: false # only to be used when testing the CI and we do not need a signed pkg
 
+- name: skipInsertion
+  type: boolean
+  default: false # just to be skipped by the unified pipeline.
+
 - name: isPR
   type: boolean
 
@@ -255,6 +259,7 @@ stages:
         repositoryAlias: ${{ parameters.repositoryAlias }}
         commit: ${{ parameters.commit }}
 
+- ${{ if eq(parameters.skipInsertion, false) }}:
   # .NET Release Prep and VS Insertion Stages, only execute them when the build comes from an official branch and is not a schedule build from OneLoc
   # setting the stage at this level makes the graph of the UI look better, else the lines overlap and is not clear.
   # Got to disable the lint check because azp yaml template engine does not allow use to do a multiline if :/