fix: Update forward merge to track remote branch [skip release] (#2627)

If for some reason someone has a branch on their forked repository that matches the branch on remote, the commands fails. This change ensures that it always tracks upstream remote instead of what you might have on your own forked repo.

[category:Infrastructure]

Co-authored-by: manuel.carrera <manuel.carrera@workday.com>

.github/workflows/forward-merge.yml

@@ -194,7 +194,7 @@ jobs:
                 ```
                 git branch -D merge/${{needs.get-branch-names.outputs.branch}}-into-${{ needs.get-branch-names.outputs.next-branch }} || true
                 git fetch upstream
-                git checkout merge/${{needs.get-branch-names.outputs.branch}}-into-${{ needs.get-branch-names.outputs.next-branch }}
+                git checkout --track upstream/merge/${{needs.get-branch-names.outputs.branch}}-into-${{ needs.get-branch-names.outputs.next-branch }}
                 git pull upstream merge/${{needs.get-branch-names.outputs.branch}}-into-${{ needs.get-branch-names.outputs.next-branch }} -f
                 node utils/forward-merge.js
                 ```