Add missing email_verification_send_failed error code

Co-authored-by: Knerio <96529060+Knerio@users.noreply.github.com>

Author: Copilot

app/services/error_code.rb

@@ -32,6 +32,7 @@ def self.error_codes
       totp_secret_already_set: { description: 'This user already has TOTP set up' },
       wrong_totp: { description: 'Invalid TOTP code provided' },
       invalid_verification_code: { description: 'Invalid verification code provided' },
+      email_verification_send_failed: { description: 'Failed to send the email verification' },
       unmodifiable_field: { description: 'The user is not permitted to modify this field' },
       failed_to_invalidate_old_backup_codes: { description: 'The old backup codes could not be deleted' },
       failed_to_save_valid_backup_code: { description: 'The new backup codes could not be saved' },

docs/graphql/enum/errorcodeenum.md

@@ -11,6 +11,7 @@ Represents the available error responses
 | `CANNOT_MODIFY_OWN_ADMIN` | Users cannot modify their own admin status |
 | `CANNOT_REMOVE_LAST_ADMINISTRATOR` | This action would remove the last administrator |
 | `CANNOT_REMOVE_LAST_ADMIN_ABILITY` | This action would remove the last administrative ability |
+| `EMAIL_VERIFICATION_SEND_FAILED` | Failed to send the email verification |
 | `EXTERNAL_IDENTITY_DOES_NOT_EXIST` | This external identity does not exist |
 | `FAILED_TO_INVALIDATE_OLD_BACKUP_CODES` | The old backup codes could not be deleted |
 | `FAILED_TO_RESET_PASSWORD` | Failed to reset the user password |