7417 workflows i can send emails using the email account (#7431)

- update `send-email.workflow-action.ts` so it send email via the google
sdk
- remove useless `workflow-action.email.ts`
- add `send` authorization to google api scopes
- update the front workflow email step form to provide a
`connectedAccountId` from the available connected accounts
- update the permissions of connected accounts: ask users to reconnect
when selecting missing send permission


![image](https://github.com/user-attachments/assets/fe3c329d-fd67-4d0d-8450-099c35933645)

packages/twenty-server/src/engine/core-modules/feature-flag/enums/feature-flag-key.enum.ts

@@ -12,4 +12,5 @@ export enum FeatureFlagKey {
   IsWorkspaceFavoriteEnabled = 'IS_WORKSPACE_FAVORITE_ENABLED',
   IsSearchEnabled = 'IS_SEARCH_ENABLED',
   IsWorkspaceMigratedForSearch = 'IS_WORKSPACE_MIGRATED_FOR_SEARCH',
+  IsGmailSendEmailScopeEnabled = 'IS_GMAIL_SEND_EMAIL_SCOPE_ENABLED',
 }