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

What does this MR do?

Replace instances of the FontAwesome bookmark icon with the GitLab SVG bookmark 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 #42018 (closed)