This pull request updates the handling of email attachments in the EmailAttachmentsNode logic to improve type safety and robustness. The main changes focus on how the attachments are represented and processed, ensuring the code handles missing attachment data more gracefully.

Attachment handling improvements:

• Changed the schema registration for the attachments pin to use ValueType::Array and set the schema to Attachment, instead of an optional vector of attachments. This makes the expected data type more explicit and consistent.
• Updated the value assignment for the attachments pin to use email.attachments.unwrap_or_default(), ensuring that an empty array is used when there are no attachments, preventing potential errors from None values.