title: How to run some tests only in azure devops CI env but not locally
body: <p>I would like to specify some long-running c# project xUnit tests to only run in azure devops CI pipeline, but not when a click 'Run All' in Visual Studio locally (vs2019). Is there a 'best practice' for this kind of behaviour?</p>
  
  <p>I played around with making a test playlist and running that locally instead of <code>Run All</code>, but that would require updating the list (or lists) everytime i add new tests and this is error-prone.</p>