Add .gitlab-ci.yml file for the 8.x-2.x branch

Seems like the pipeline run with no issues: https://git.drupalcode.org/project/brokenlinks/-/pipelines/499469

It seems like there some CSPELL / PHPCS and PHPSTAN issues to fix, but I will address these in another issue.

I'll merge it to the 8.x-2.x branch

Moved to "Fixed" for now, seems to be working fine, I'll address the PHPCS / CSPELL issues reported at: https://www.drupal.org/project/brokenlinks/issues/3525061 🐛 Fix CSPELL - ESLINT - PHPCS - STYLEINT Active

Automatically closed - issue fixed for 2 weeks with no activity.