Inter branch flow script doesn't check co-authors and therefore doesn't create PRs

See this GH actions run: https://github.com/dotnet/command-line-api/actions/runs/19358489287/job/55384584514

> Skipping PR generation because it appears this PR would only contain automated commits by @dotnet-maestro[bot]

That's the important part. The action skips creating a PR because it thinks that all changes are automation only. But often, additional changes or fixes necessary to unblock the code flow PR get added to such a PR. In such a case, my user name is mentioned as a co-author, not as the author.

See See https://github.com/dotnet/command-line-api/commit/c7b5e07cfed85e88c162dc1c916efaff03742e6e.patch for a commit example.

@markwilkie / @mmitche do you know who owns that? I see that Farhad created the powershell script but it doesn't look like he's still on the .NET team.