fix(test): skip artifact private repo test. Fixes: #8953

[ibotdotout]

Fixes #8953

~Introduced SKIP_PRIVATE_REPO environment variable to skip TestGitArtifactDriver_Load PrivateRepo test that some contributors lack of private repo access.~

Update test to skip TestGitArtifactDriver_Load PrivateRepo.

---

Please do not open a pull request until you have checked ALL of these:

• [x] Create the PR as draft .
• [x] Run make pre-commit -B to fix codegen and lint problems.
• [x] Sign-off your commits (otherwise the DCO check will fail).
• [x] Use a conventional commit message (otherwise the commit message check will fail).
• [x] "Fixes #" is in both the PR title (for release notes) and this description (to automatically link and close the issue).
• [x] Add unit or e2e tests. Say how you tested your changes. If you changed the UI, attach screenshots.
• [x] Github checks are green.
• [x] Once required tests have passed, mark your PR "Ready for review".

If changes were requested, and you've made them, dismiss the review to get it reviewed again.

[ibotdotout]

There are already environment variables that controls this test

I see then how about just update document and git hook pre-commit message.

Let me know if you have another suggestion.

[ibotdotout]

Could you help to merge ? I rebased and pushed to re-trigger e2e that failed and the auto-merge is gone.