fix(plugin-init): check git repository using git cli

[BasixKOR]

What's the problem this PR addresses?

Fixes #6521.

...

How did you fix it?

Use Git CLI instead to detect if git init is nesscary. ...

Checklist

• [x] I have read the Contributing Guide.

• [x] I have set the packages that need to be released for my changes to be effective.

• [ ] I will check that all automated PR checks pass before the PR gets reviewed.

[arcanis]

Seems like a reasonable approach - can you add a test to avoid regressions?