WIP: Resolve "Replace fa-heart with GitLab SVG heart icon"

What does this MR do?

Replace the FontAwesome heart icon with the GitLab SVG heart icon.

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

N/A

Security

N/A

Closes #55288 (closed)