Fix broken master

What does this MR do and why?

Contributes to gitlab-org/quality/engineering-productivity/master-broken-incidents#3324 (closed)

Problem

After change in !98210 (diffs), some tests started failing. The root cause is creation or deletion of files in the shared repository.

Solution

Create temporary projects for cases when we expect modifications of the repository.

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.