CORE-5832 Refactored reference genomes endpoints.

Renamed /secured/reference-genomes endpoints to GET /reference-genomes and PUT /admin/reference-genomes.
Refactored metadactyl.metadata.reference-genomes to work with the new schema, updated error messages, and consolidated some functions.
Added swagger docs to metadactyl for these endpoints.
CORE-5832 Refactored /delete-categories endpoint.

Renamed to /admin/apps/categories/shredder and added swagger docs to metadactyl endpoint.
Added kameleon.app-groups/delete-app-category.