Fix Linting Issues - 5.0.x-dev

Assigning this to myself to begin work on the issue, thanks!

I have completed fixing all the linting issues that were discovered by adding the gitlab-ci.yml file to the module.
I have also updated the variables in the gitlab-ci.yml file.

Moving to "Needs review" status and unassigning myself from the issue, thanks!

Lint issues seem to be resolved, but cspell is still throwing a warning.

If you look at the cspell error, it flags 'Grey' and 'grey' repeatedly.
If you look at the variables section of the gitliab-ci.yml you can see the list of words that should be ignored.
Both 'Grey' and 'grey' are on the list but the linting continues to flag it.
I am unsure of why this is happening or exactly how to fix it