[CI] Remove steps that are never used. (#11026) (#11046)

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

@@ -321,12 +321,6 @@ steps:
   continueOnError: true # should not stop the build since is not official just yet.
   timeoutInMinutes: 180
 
-- bash: $(Build.SourcesDirectory)/xamarin-macios/tools/devops/automation/scripts/bash/productsign.sh
-  env:
-    PRODUCTSIGN_KEYCHAIN_PASSWORD: $(xma-password)
-  displayName: 'Signing PR Build'
-  condition: and(succeeded(), contains(variables['configuration.BuildPkgs'], 'True'), contains(variables['configuration.SignPkgs'], 'True'), contains(variables['configuration.IsPr'], 'True'))
-
   # Ensure virtualenv is on the PATH
 - template: set-path/v1.yml@templates
   parameters:
@@ -358,6 +352,7 @@ steps:
   inputs: 
     signType: 'Real'  # test is not present for mac.. 
     azureSubscription: 'MicroBuild Signing Task (DevDiv)'
+    zipSources: false  # we do not use the feature and makes the installation to last 10/12 mins instead of < 1 min
   condition: and(succeeded(), contains(variables['configuration.SignPkgs'], 'True'), contains(variables['configuration.IsPr'], 'False')) # if we are a PR, the installation of the plugin will return a 403 and everything will collapse
   env:
       SYSTEM_ACCESSTOKEN: $(System.AccessToken)