refactor: Webhooks (#12487)

Closes #12303

### What’s Changed
- Replace auto‐save with explicit Save / Cancel
Webhook forms now use manual “Save” and “Cancel” buttons instead of the
old debounced auto‐save/update.

- Separate “New” and “Detail” routes
Two dedicated paths `/settings/webhooks/new` for creation and
/`settings/webhooks/:webhookId` for editing, making the UX clearer.

- URL hint & normalization
If a user omits the http(s):// scheme, we display a “Will be saved as
https://…” hint and automatically default to HTTPS.

- Centralized validation with Zod
Introduced a `webhookFormSchema` for client‐side URL, operations, and
secret validation.

- Storybook coverage
Added stories for both “New Webhook” and “Webhook Detail”

- Unit tests
Added tests for the new `useWebhookForm` hook

packages/twenty-server/src/engine/api/graphql/workspace-query-runner/workspace-query-hook/workspace-query-hook.module.ts

@@ -9,6 +9,7 @@ import { BlocklistQueryHookModule } from 'src/modules/blocklist/query-hooks/bloc
 import { CalendarQueryHookModule } from 'src/modules/calendar/common/query-hooks/calendar-query-hook.module';
 import { ConnectedAccountQueryHookModule } from 'src/modules/connected-account/query-hooks/connected-account-query-hook.module';
 import { MessagingQueryHookModule } from 'src/modules/messaging/common/query-hooks/messaging-query-hook.module';
+import { WebhookQueryHookModule } from 'src/modules/webhook/query-hooks/webhook-query-hook.module';
 import { WorkspaceMemberQueryHookModule } from 'src/modules/workspace-member/query-hooks/workspace-member-query-hook.module';
 
 @Module({
@@ -17,6 +18,7 @@ import { WorkspaceMemberQueryHookModule } from 'src/modules/workspace-member/que
     CalendarQueryHookModule,
     ConnectedAccountQueryHookModule,
     BlocklistQueryHookModule,
+    WebhookQueryHookModule,
     WorkspaceMemberQueryHookModule,
     DiscoveryModule,
   ],