Add gitlab-ci file to run linter and other checks on the module

Added the .gitlab-ci.yml file here https://git.drupalcode.org/project/codit_batch_operations/-/merge_reques... and you can see the pipeline run here https://git.drupalcode.org/issue/codit_batch_operations-3436881/-/pipeli....

Got some cleanup to do, eep.

Eeep is right. :) Some of these are easy but some may be problematic because the base class is calling methods that only exist in the extended classes which implement the interface which requires the missing methods to be added. I'll have to ponder that one a bit.

Agreed. We might need to escape some of them.

I made some changes to get all of theses checks passing. Thank you dmundra for this contribution.

Released with https://www.drupal.org/project/codit_batch_operations/releases/1.0.1-beta6 →