✅ Specs for Hyrax::FlexibleSchema need to be done

[ShanaLMoore]

Summary

Add specs for the Hyrax::FlexibleSchema class

Parent Ticket

• ☄️ 🎁 Create and expand Dynamic Schema functionality #5

Base work off of the WIP PR

Acceptance Criteria

• Hyrax::FlexibleSchema has spec coverage

Screenshots or Video

Testing Instructions

Notes