feat(pricing/ai): improve billing metered pricing + add pricing on ai chat (#14092)

## TODO:

- [x] display "yearly" or "monthly" wording everywhere it's needed
- [ ] Add button with "downgrade" or "upgrade" to save the change of
credits price + modal to validate
- [x] Add renewal date 
- [ ] Implement
https://docs.stripe.com/billing/subscriptions/subscription-schedules for
`switchFromYearlyToMonthly` and decrease number of credits

packages/twenty-front/src/modules/users/graphql/fragments/userQueryFragment.ts

@@ -69,10 +69,12 @@ export const USER_QUERY_FRAGMENT = gql`
         status
         interval
         metadata
+        currentPeriodEnd
         billingSubscriptionItems {
           id
           hasReachedCurrentPeriodCap
           quantity
+          stripePriceId
           billingProduct {
             name
             description