Fix phpcs warnings in pipeline

Added phpcs in the gitlab-cli.yml now working on fixing the issues here.

Hi maintainers I have added this template, please review it

PHPCS is done, Php unit though is throwing an error.

Thanks @techmantejas

i'll get onto review this shortly.

I was thinking we could merge all these into the gitlab-resolve branch, so that #3408084 would resolve?

Yup, in this MR:-

1. Updated gitlab-ci.yml to have the template for composer phpcs phpstan phpunit
2. Fixed phpcs issues that were occuring in file

So you can consider the phpcs issue fixes in the src files of the module, that should solve things from this child issue.