chore: add a Windows test on long path with git

[lemeurherveCB]

This PR adds a test to ensure git can works with long paths on Windows.

In draft until a new Git for Windows version is published to fix long paths.

From https://github.com/git-for-windows/git/pull/5550#issuecomment-2893352962:

<...> the next Git version, v2.50.0, is planned for June 13th, 2025, and traditionally Git for Windows follows that release cycle.

Ref:

• https://github.com/jenkins-infra/helpdesk/issues/4574
• https://github.com/git-for-windows/git/issues/5476#issuecomment-2733088835
• Seems fixed in https://github.com/git-for-windows/git/pull/5550 (no release yet)

Testing done

Submitter checklist

• [x] Make sure you are opening from a topic/feature/bugfix branch (right side) and not your main branch!
• [x] Ensure that the pull request title represents the desired changelog entry
• [x] Please describe what you did
• [x] Link to relevant issues in GitHub or Jira
• [x] Link to relevant pull requests, esp. upstream and downstream changes
• [x] Ensure you have provided tests - that demonstrates feature works or fixes the issue