CI: remove PR specific job enablement (#1798)

The following commit added the PR to the jobs to build for. This isn't needed anymore, so remove
9e440c6db9 (diff-78a8a19706dbd2a4425dd72bdab0502ed7a2cef16365ab7030a5a0588927bf47)

Co-authored-by: Devin Binnie <52460000+devinbinnie@users.noreply.github.com>

.circleci/config.yml

@@ -571,7 +571,6 @@ workflows:
             branches:
               only:
                 - /^release-\d+(\.\d+){1,2}(-rc.*)?/
-                - pull/1810
 
       - store_artifacts:
           # for master/PR builds