title: Prevent branches from being deleted on PR completion
body: <p>In Azure Devops I have a git repository with a develop branch.  We create multiple feature branches from this branch and merge code into develop via pull requests.  Once we complete the pull requests the feature branches get deleted.  </p>
  
  <p>I want to prevent this from happening.  I'd like to keep these feature branches.  How can I do that?</p>