Removing some extra auto-generated configurations and terraform related files and folders

[Chambras]

Description

I noticed the clean script does not remove these:
/src/terraform/mlz/config.vars
/src/terraform/mlz/.terraform.lock.hcl
/src/terraform/mlz/.terraform

Issue reference

NA

Checklist

Please make sure you've completed the relevant tasks for this PR, out of the following list:

• [ x] Code compiles or validates correctly
• [ x] BASH scripts have been validated using shellcheck
• [ x] All tests pass (manual and automated)
• [x ] The documentation is updated to cover any new or changed features
• [x ] Markdown files have been linted using the recommended linter. (See .vscode/extensions.json.)
• [x ] Relevant issues are linked to this PR