ISTWCMS-4791: add variable so theming knows what branding level was selected.
Sets up the required variable to test the changes in the matching branch from uw_wcms_gesso.
On or around 9:00am on Tuesday the 17th of February, git.uwaterloo.ca will be restarted to apply security and application patches. This maintenance should bring GitLab to latest patch in 18.8.x release line.
Sets up the required variable to test the changes in the matching branch from uw_wcms_gesso.