Variables compiler pass and fix tests again
- Drupal variables compiler pass: &variable_name& can now be injected into services as arguments as property values.
  Value is resolved when service is instantiated (unlike parameters which are resolved at compile time)
- Tests assumed cache::isFresh only takes configuration files into account, but all compiler pass files are checked as well.
  composer update/install therefore broke all tests for an hour.
  Currently fixed by also touch'-ing those files into the past (better fix would toggle the cached container into the past/future)