📝 Add env WHATSAPP_CLOUD_API_URL to possible change https://gr… (#1170)

refs #1117 

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->
## Summary by CodeRabbit

- **Refactor**
- Dynamically construct API URLs for WhatsApp features using environment
variables for improved reliability and configurability.
- Updated `sendWhatsAppMessage` function to use
`env.WHATSAPP_CLOUD_API_URL` for URL construction, allowing for more
dynamic configuration.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->

---------

Co-authored-by: Baptiste Arnaud <baptiste.arnaud95@gmail.com>

packages/bot-engine/whatsapp/sendWhatsAppMessage.ts

@@ -3,6 +3,7 @@ import {
   WhatsAppCredentials,
   WhatsAppSendingMessage,
 } from '@typebot.io/schemas/features/whatsapp'
+import { env } from '@typebot.io/env'
 
 type Props = {
   to: string
@@ -16,7 +17,7 @@ export const sendWhatsAppMessage = async ({
   credentials,
 }: Props) =>
   got.post({
-    url: `https://graph.facebook.com/v17.0/${credentials.phoneNumberId}/messages`,
+    url: `${env.WHATSAPP_CLOUD_API_URL}/v17.0/${credentials.phoneNumberId}/messages`,
     headers: {
       Authorization: `Bearer ${credentials.systemUserAccessToken}`,
     },