feat(mobile-vitals): Change mobile performance landing badge to new (#28075)

This changes the beta badge to new in preparation to GA the mobile performance
landing page.

static/app/views/performance/landing/utils.tsx

@@ -54,7 +54,7 @@ export const LANDING_DISPLAYS = [
     field: LandingDisplayField.MOBILE,
     isShown: (organization: Organization) =>
       organization.features.includes('performance-mobile-vitals'),
-    badge: 'beta' as const,
+    badge: 'new' as const,
   },
 ];