Enable powershell native clone

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What does this MR do?

This MR adds native git clone for PowerShell

Why was this MR needed?

native git clone for PowerShell was skipped by !5010 (merged)

What's the best way to test this MR?

go test gitlab.com/gitlab-org/gitlab-runner/executors/shell -v -cover -tags integration -run TestGitCloneOrFetch

What are the relevant issue numbers?