The ghprbPullLink is incorrectly linking to api.github.com is some circumstances.

Incorrect:
https://api.github.com/repos/org-here/repo-here/pulls/1234

The prior behavior which is correct for our usage:
https://github.com/org-here/repo-here/pull/1234

Different builds show either result depending on how it was triggered. It seems when the build starts via a "retest this please" regex match we get the incorrect url.

When the build is triggered by an initial pull request it is correct and can be resolved.