chore: mark SSO as an Enterprise only feature (#9071)

https://linear.app/unleash/issue/2-3124/mark-sso-as-an-enterprise-only-feature

For all intents and purposes, SSO seems to have always been an
Enterprise only feature. It just wasn't very clear previously.

See: https://github.com/Unleash/unleash/pull/9045/files#r1899635618


![image](https://github.com/user-attachments/assets/7ffed499-83d6-4dc2-ae11-6b0d930a82d1)

frontend/src/component/admin/adminRoutes.ts

@@ -58,7 +58,7 @@ export const adminRoutes: INavigationMenuItem[] = [
     {
         path: '/admin/auth',
         title: 'Single sign-on',
-        menu: { adminSettings: true, mode: ['pro', 'enterprise'] },
+        menu: { adminSettings: true, mode: ['enterprise'] },
         group: 'access',
     },
     {

frontend/src/component/admin/auth/AuthSettings.tsx

@@ -1,6 +1,5 @@
 import { Tab, Tabs } from '@mui/material';
 import { PageContent } from 'component/common/PageContent/PageContent';
-import { ConditionallyRender } from 'component/common/ConditionallyRender/ConditionallyRender';
 import useUiConfig from 'hooks/api/getters/useUiConfig/useUiConfig';
 import { OidcAuth } from './OidcAuth/OidcAuth';
 import { SamlAuth } from './SamlAuth/SamlAuth';
@@ -45,15 +44,16 @@ export const AuthSettings = () => {
     const [activeTab, setActiveTab] = useState(0);
     usePageTitle(`Single sign-on: ${tabs[activeTab].label}`);
 
+    if (!isEnterprise()) {
+        return <PremiumFeature feature='sso' page />;
+    }
+
     return (
         <div>
             <PermissionGuard permissions={[ADMIN, UPDATE_AUTH_CONFIGURATION]}>
                 <PageContent
                     withTabs
                     header={
-                        <ConditionallyRender
-                            condition={isEnterprise()}
-                            show={
                         <Tabs
                             value={activeTab}
                             onChange={(_, tabId) => {
@@ -77,12 +77,7 @@ export const AuthSettings = () => {
                             ))}
                         </Tabs>
                     }
-                        />
-                    }
                 >
-                    <ConditionallyRender
-                        condition={isEnterprise()}
-                        show={
                     <div>
                         {tabs.map((tab, index) => (
                             <TabPanel
@@ -94,9 +89,6 @@ export const AuthSettings = () => {
                             </TabPanel>
                         ))}
                     </div>
-                        }
-                        elseShow={<PremiumFeature feature='sso' />}
-                    />
                 </PageContent>
             </PermissionGuard>
         </div>

frontend/src/component/common/PremiumFeature/PremiumFeature.tsx

@@ -89,7 +89,7 @@ const PremiumFeatures = {
         label: 'User groups',
     },
     sso: {
-        plan: FeaturePlan.PRO,
+        plan: FeaturePlan.ENTERPRISE,
         url: 'https://docs.getunleash.io/reference/rbac#user-group-sso-integration',
         label: 'Single Sign-On',
     },