configure feature_oidc_native_flow as a feature setting, update copy (#11773)

src/i18n/strings/en_EN.json

@@ -1427,7 +1427,8 @@
         "notification_settings_beta_caption": "Introducing a simpler way to change your notification settings. Customize your %(brand)s, just the way you like.",
         "notification_settings_beta_title": "Notification Settings",
         "notifications": "Enable the notifications panel in the room header",
-        "oidc_native_flow": "Enable new native OIDC flows (Under active development)",
+        "oidc_native_flow": "OIDC native authentication",
+        "oidc_native_flow_description": "⚠ WARNING: Experimental. Use OIDC native authentication when supported by the server.",
         "pinning": "Message Pinning",
         "render_reaction_images": "Render custom images in reactions",
         "render_reaction_images_description": "Sometimes referred to as \"custom emojis\".",

src/settings/Settings.tsx

@@ -444,8 +444,11 @@ export const SETTINGS: { [setting: string]: ISetting } = {
         default: false,
     },
     [Features.OidcNativeFlow]: {
+        isFeature: true,
+        labsGroup: LabGroup.Developer,
         supportedLevels: LEVELS_FEATURE,
         displayName: _td("labs|oidc_native_flow"),
+        description: _td("labs|oidc_native_flow_description"),
         default: false,
     },
     "feature_rust_crypto": {