FEATURE: add new hidden site setting to show full names in user card

adds a hidden site setting, "prioritize_full_names_in_ux", whose effect is to prefer full names in user-menu notifications

Co-authored-by: Mark VanLandingham <markvanlan@gmail.com>
Co-authored-by: Alan Guo Xiang Tan <gxtan1990@gmail.com>

config/site_settings.yml

@@ -759,6 +759,10 @@ users:
   prioritize_username_in_ux:
     client: true
     default: true
+  prioritize_full_name_in_ux:
+    client: true
+    default: false
+    hidden: true
   email_token_valid_hours:
     default: 48
     min: 1