CI implementation for the module

Hey!

I've added CI scripts to the module.
Also, I changed the scope of Drupal versions for the module and fixed a coding standard issue that triggered CI scripts to fail.

🐛 PHPUnit job hangs as of update to PHPUnit 11.5.29 Active

@jcandan, thanks for flagging the issue with the PHPUnit fix.

Now all CI jobs are green.

Committed to a brand new 1.2.x branch (a branch for D11 support).
Those changes will be a part of the future 1.2.0 module release.
Thanks!