Automated testing: Configure GitLab CI

Liam Morland → made their first commit to this issue’s fork.

Hi Joseph (@joseph.olstad),

Could you please help us take a look at this MR when you have some time ?

I've paid particular attention not to modify anything that could break Backward Compatibility (BC), such as translated strings or class names.

At this point, MR!29 seems to be passing all jobs except ESLint and PHPStan which are probably more complicated and would most likely require specific issues to fix :
MR!29 Pipeline: https://git.drupalcode.org/issue/shs-3433198/-/pipelines/264680

Moving issue to Needs review and bumping to Major as an attempt to attract maintainers attention.

Feel free to let us know if you have any questions or concerns on any of the changes in the merge request or this ticket in general, we would surely be glad to help.
Thanks in advance!

phpcs is failing, please turn phpcs OFF

phpcs issues fixed.

phpunit tests were failing due to 📌 Update templates so 11.0 is the default/current branch RTBC . I fixed this by pinning the version of the testing template as recommended in 🐛 Stop changing the meaning of tests Active .

Looking great, also nice to see the coding standards check pass!

Needs to be ported to the 3.x branch.

did a partial cherry pick of the work from 2.0.x into 3.0.x . Not sure if this will work as expected.

Good enough for now, if you want to push this further , open a new issue