Revert "PERF: Cache categories in Site model take 2." (PR #13465)

This reverts commit 06fa1efd3d8a935a5ae3e7876dbbaa3193316d7c.

Breakage in solved plugin

GitHub

cc @tgxworld this broke with the solved plugin in production.

@tgxworld you probably need a compatibility layer on the JS side so that accesses to custom_fields also check preloaded_custom_fields.