exclude versionButton.php from rsync command

[arezaii]

This updates the GHCI workflow to stop deleting the versionButton.php file on the remote side.

Since #26670 removed versionButton.php, rsync wants to delete it now since it doesn't exist on the source side. This adds an exclude option to the rsync command to ignore it.

[bradcray]

This seems surprising to me since #26670 didn't remove the file, it just changed it into a symbolic link (and that link should be rsync'd over with the rest of the docs, as the current publish-module-docs job is doing).

Could an rsync -l be what's needed here to preserve the symbolic link on the rsync rather than following it? (assuming there are no other symbolic links that we're relying on following during the rsync… If there are, we'll probably need to break this into two rsync commands?)