Added FOCUS-53604 - Communication: Validate Email Format in Cc Field

This update improves email validation logic in the Communication Queue to prevent failed sends caused by invalid Cc addresses. The system now blocks email addresses that include a period directly before the @ symbol, a period at the end of the email, or contain consecutive periods. Additionally, when entering multiple Cc addresses, they must be separated by either a comma or a semicolon. These enhancements ensure cleaner delivery attempts, reduce errors, and provide more reliable message processing.