13495-c: Add design-at-version GraphQL entities

What does this MR do?

This adds GraphQL entities for Designs-At-Versions

This builds on !21119 (merged) and !21264 (merged)

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

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.

See: #13495 (closed)