Workflow Send Email Node Multiple Recipients Support (#17458)

This PR adds support sending emails to multiple recipients

Figma Reference:

https://www.figma.com/design/xt8O9mFeLl46C5InWwoMrN/Twenty?node-id=88868-88963&t=Ya0csmNlN4xxczvV-11

Demo:


https://github.com/user-attachments/assets/ecaeaaec-fe42-4fb5-96d3-a91d08b30148

packages/twenty-server/src/modules/workflow/workflow-executor/workflow-actions/mail-sender/types/workflow-send-email-action-input.type.ts

@@ -1,6 +1,8 @@
+import { type EmailRecipients } from 'twenty-shared/workflow';
+
 export type WorkflowSendEmailActionInput = {
   connectedAccountId: string;
-  email: string;
+  recipients: EmailRecipients;
   subject?: string;
   body?: string;
 };