[CI] If we disabled the api diff do not event spawn a job. (#13875)

tools/devops/automation/templates/build/stage.yml

@@ -116,6 +116,7 @@ jobs:
       skipESRP: ${{ parameters.skipESRP }}
       enableAPIDiff: false # this step should never execute the api diff, that should be left for the parallel job
 
+- ${{ if eq(parameters.enableAPIDiff, true) }}:
   - job: api_diff
     dependsOn:
     - AgentPoolSelector
@@ -149,7 +150,7 @@ jobs:
         gitHubToken: ${{ parameters.gitHubToken }}
         xqaCertPass: ${{ parameters.xqaCertPass }}
         enableDotnet: ${{ parameters.enableDotnet }}
-      enableAPIDiff: ${{ parameters.enableAPIDiff }}
+        enableAPIDiff: true
 
 - job: upload_azure_blob
   displayName: 'Upload packages to Azure & SBOM'