Improve coding standards

I've fixed the phpcs and stylelint warnings.

cspell:
There are a lot of spelling issues related to URLs for external libraries, I'm not sure how to tell the job to ignore these, I would have expected these to be ignore already by core .cspell.json. I've added some ignored words to the .gitlab-ci.yml. There are some French words, I'm not sure where these are coming from as I can't find them when I search the module.

The eslint would probably need it's own issue as there is a lot going on, or just leave it for now.

I'll fix the dependency injection issues for phpstan and then wait for feedback.