Preload project features in reference parser

What does this MR do?

Preloading of project_features mitigates N+1 queries when checking references in other projects.

When loading projects for resources referenced in comments it makes sense to include also associated project_features because in the following step (can_read_reference?(user, projects[node], node)) project features is used for checking permissions for the given project.

What are the relevant issue numbers?

Fixes #43094 (closed) (I'm not sure if this is a complete fix though - there may be different N+1 issues for other resources)

Does this MR meet the acceptance criteria?

• Changelog entry added, if necessary
• Documentation created/updated
• Tests added for this feature/bug
• Conforms to the code review guidelines
• Conforms to the merge request performance guidelines
• Conforms to the style guides
• Conforms to the database guides