E2E: Use separate project for github import test

What does this MR do and why?

Describe in detail what your merge request does and why.

Use separate github project for import test.

Currently used project is used by github repo mirror test which creates new commits, gradually making import slower since it needs to import more and more commits.

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.