Fix order dependant spec, do not write file in test

What does this MR do and why?

Describe in detail what your merge request does and why.

• Fixes order dependant spec failure - example: https://gitlab.com/gitlab-org/gitlab-qa/-/jobs/2832506810
• Mocks file writing in another spec to not pollute git directory every time a test is executed

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

bundle exec rspec

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.