Add more QA SSH key tests

What does this MR do?

Add more QA SSH key tests

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

People are using them

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Tests added for this feature/bug
• Review
  • Has been reviewed by Backend
• End-to-end tests pass (package-qa manual pipeline job)

What are the relevant issue numbers?

Closes gitlab-qa#183 (closed)