add trial period ending banner + server logic (#11389)

Solution : 
- if user reaches his workflow usage cap + in trial period > display
banner
- end trial period if user has payment method (if not, not possible)

<img width="941" alt="Screenshot 2025-04-04 at 10 27 32"
src="https://github.com/user-attachments/assets/d7a1d5f7-9b12-4a92-a7c7-15ef8847c790"
/>

packages/twenty-front/src/pages/onboarding/ChooseYourPlan.tsx

@@ -125,7 +125,7 @@ export const ChooseYourPlan = () => {
     (plan) => plan.planKey === currentPlan,
   )?.baseProduct;
 
-  const baseProductPrice = baseProduct?.prices.find(
+  const baseProductPrice = baseProduct?.prices?.find(
     (price): price is BillingPriceLicensedDto =>
       isBillingPriceLicensed(price) &&
       price.recurringInterval === SubscriptionInterval.Month,