@Native-Coder - Thanks for the post!
It looks like the instance you are working on may be a few versions behind based on the docs link. A bug fix was shipped with GitLab 13.4 to fix an issue in which the ENV variables were not being passed correctly. Without this bug fix your best option is to add directories to a custom .codeclimate.yml file for exclusion. You can see this in practice in the default .codeclimate.yml in the codequality project.
I hope this helps!
-James H, GitLab Product Manager, Verify:Testing