Remove role color highlighting from custom css (#33493)

spec/requests/custom_css_spec.rb

@@ -45,34 +45,5 @@ RSpec.describe 'Custom CSS' do
         CSS
       end
     end
-
-    context 'with highlighted colored UserRole records' do
-      before do
-        _highlighted_colored = Fabricate :user_role, highlighted: true, color: '#336699', id: '123_123_123'
-        _highlighted_no_color = Fabricate :user_role, highlighted: true, color: ''
-        _no_highlight_with_color = Fabricate :user_role, highlighted: false, color: ''
-      end
-
-      it 'returns stylesheet from settings' do
-        get '/custom.css'
-
-        expect(response)
-          .to have_http_status(200)
-          .and have_cacheable_headers
-          .and have_attributes(
-            content_type: match('text/css')
-          )
-        expect(response.body.strip)
-          .to eq(expected_css)
-      end
-
-      def expected_css
-        <<~CSS.strip
-          .user-role-123123123 {
-            --user-role-accent: #336699;
-          }
-        CSS
-      end
-    end
   end
 end