title: Remove unused form filters
body: <p>When a new schema is being created, its possible to avoid the forms filters auto-generation using the following option:</p>
  
  <pre><code>ExampleEntity:
    symfony:
      options:
        filters: false
  </code></pre>
  
  <p>In my particular case, the app is already in production and I would like to know the best approach to remove all unused form filters from my project. Doctrine has bundled a simple and nice task to be run or I have to delete all the files place in the filters directory?</p>