DEV: Puts full name updates behind hidden setting

lib/assigner.rb

@@ -492,7 +492,7 @@ def queue_notification(assignment)
   end
 
   def small_action_username_or_name(assign_to)
-    if (assign_to.is_a?(User) && !SiteSetting.prioritize_username_in_ux) ||
+    if (assign_to.is_a?(User) && SiteSetting.prioritize_full_name_in_ux) ||
          !assign_to.try(:username)
       custom_fields = { "action_code_who" => assign_to.name || assign_to.username }
     else

spec/system/assign_post_spec.rb

@@ -12,7 +12,6 @@
   before do
     skip "Tests are broken and need to be fixed. See https://github.com/discourse/discourse/actions/runs/13890376408/job/38861216842"
     SiteSetting.assign_enabled = true
-    SiteSetting.prioritize_username_in_ux = true
     # The system tests in this file are flaky and auth token related so turning this on
     SiteSetting.verbose_auth_token_logging = true
 
@@ -61,7 +60,7 @@ def assign_post(post, assignee)
     end
 
     context "when prioritize_full_name_in_ux setting is enabled" do
-      before { SiteSetting.prioritize_username_in_ux = false }
+      before { SiteSetting.prioritize_full_name_in_ux = true }
 
       it "shows the user's name after assign" do
         visit "/t/#{topic.id}"

spec/system/assign_topic_spec.rb

@@ -50,7 +50,7 @@
     end
 
     context "when prioritize_full_name_in_ux setting is enabled" do
-      before { SiteSetting.prioritize_username_in_ux = false }
+      before { SiteSetting.prioritize_full_name_in_ux = true }
 
       it "shows the user's name after assign" do
         visit "/t/#{topic.id}"