Add banzai filter to detect commit message trailers and properly link the users

What does this MR do?

This MR adds implementation for #31640 (closed)

Screenshots

Before

After

Feature roadmap

• Detect multiple Co-Authors
• Link Co-Authors using their emails
• Link to mail-to if co-authors are not gitlab users
• Detect Co-Authored-By: regardless of case
• Link Co-Authors using their reference handles
• Add tooltip for the name link hover
• Recognize other tags as mentioned Here
• Group tags together (place authors on the same line?)
• Add specs
• Refactor link_tag method to use keyword arguments

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• API support added
• Tests added for this feature/bug
• Review
  • Has been reviewed by UX
  • Has been reviewed by Frontend
  • Has been reviewed by Backend
  • Has been reviewed by Database
• Conform by the merge request performance guides
• Conform by the style guides
• Squashed related commits together
• Internationalization required/considered
• End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #31640 (closed)