Add PhpStan to the test suite

It's now also in Drupal Core (https://www.drupal.org/node/3258232) and will be helpful in our dev stack too.

added To Do label

changed the description

added Doing label and removed To Do label

assigned to @jurgenhaas

mentioned in commit b41e36bc

mentioned in commit docker/gitlab-drupal-ci@c80d163d

closed

removed Doing label