[CI][VSTS] Use the same script as other jobs to clean the macOS bots. (#10629)

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

@@ -37,14 +37,10 @@ steps:
     gci env: | format-table -autosize -wrap
   displayName: 'Dump Environment'
 
-# Uses the powershell cmdlet to remove known directories that are not needed and use space.
-# we might hit issue https://github.com/PowerShell/PowerShell/issues/9246, so we always do exit 0
-- pwsh: |
-    Import-Module $Env:SYSTEM_DEFAULTWORKINGDIRECTORY/xamarin-macios/tools/devops/automation/scripts/System.psm1
-    Clear-HD 
-    exit 0  
-  displayName: 'Disk cleanup'
-  timeoutInMinutes: 5
+- bash: $(System.DefaultWorkingDirectory)/xamarin-macios/tools/devops/automation/scripts/bash/clean-bot.sh
+  displayName: 'Clean bot'
+  env:
+    BUILD_REVISION: 'jenkins'
   continueOnError: true
 
 # Use a cmdlet to check if the space available in the devices root system is larger than 50 gb. If there is not