Re: #110652, revert PRs #109890 and #109891 because we didn't find a portable solution that works on both macOS and Windows.

I kept a couple of the string formatting (and whitespace) improvements:

-    return "{} file{}".format(count, "s" if count != 1 else "")
+    s = "s" if count != 1 else ""
+    return f"{count} file{s}"

-    cmd = "git remote show {}".format(remote_name).split()
+    cmd = f"git remote show {remote_name}".split()

(I suggest finding existing pre-commit checks that can do more-or-less the same thing as the patchcheck things. They don't necessarily need to be exactly the same.)

• Issue: Move Azure Pipelines CI to GitHub Actions #109408