[#13133] Add Google Calendar Link to Email Templates

[itstrueitstrueitsrealitsreal]

Fixes #13133

Outline of Solution

This PR implements the ability for email recipients to easily add events to their Google Calendar. The changes include:

• Adding a new method in TimeHelper called getGoogleCalendarLink, which formats the deadline, title, and description of tasks into a usable Google Calendar link.
• Updating email templates to include this link, enhancing the functionality of our email system to provide better user experience.
• All related tests have been updated to ensure they pass with the new email format.