Fix missing components.schema for webhooks (#13433)

Webhooks are still documented in core playground to detail Webhooks of
core objects.
We moved webhooks to metadata playground and forgot to keep computation
of WebhookForResponse

This PR adds it back

packages/twenty-front/src/modules/settings/playground/components/RestPlayground.tsx

@@ -81,6 +81,7 @@ export const RestPlayground = ({ onError, schema }: RestPlaygroundProps) => {
             forceDarkModeState: theme.name === 'dark' ? 'dark' : 'light',
             hideClientButton: true,
             hideDarkModeToggle: true,
+            hideModels: schema === 'metadata',
             pathRouting: {
               basePath: getSettingsPath(SettingsPath.RestPlayground, {
                 schema,