fix: prevent billingPortal creation if no active subscription (#9701)

Billing portal is created in settings/billing page even if subscription
is canceled, causing server internal error. -> Skip back end request

Bonus : display settings/billing page with disabled button even if
subscription is canceled

---------

Co-authored-by: etiennejouan <jouan.etienne@gmail.com>
Co-authored-by: Charles Bochet <charles@twenty.com>

packages/twenty-front/src/testing/mock-data/users.ts

@@ -73,6 +73,13 @@ export const mockCurrentWorkspace: Workspace = {
     interval: SubscriptionInterval.Month,
     status: SubscriptionStatus.Active,
   },
+  billingSubscriptions: [
+    {
+      __typename: 'BillingSubscription',
+      id: '7efbc3f7-6e5e-4128-957e-8d86808cdf6a',
+      status: SubscriptionStatus.Active,
+    },
+  ],
   workspaceMembersCount: 1,
   databaseSchema: '',
   databaseUrl: '',