* Add MemberType/MemberTypeContainer to supported EntityContainer object types
* Implement MemberTypeContainerRepository
* Update and add member type container API endpoints
* Complete server and client-side implementation for member type container support.
* Fix FE linting errors.
* Export folder constants.
* Applied suggestions from code review.
* Updated management API authorization tests for member types.
* Resolved breaking change on copy member type controller.
* Allow content types to be moved to own folder without error.
* Use flag providers for member type siblings endpoint.
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Co-authored-by: Andy Butland <abutland73@gmail.com>