Currently, the deprecations service (#94845) returns all Kibana deprecations and there is not an easy way to identify between config deprecations and others. I propose adding a deprecationType field (related code) to be able to distinguish between the deprecation types.

Example use case: In Upgrade Assistant, we may want to allow the user to sort by deprecation type. Another option is to show config deprecations in a separate tab, similarly to how the Elasticsearch deprecations are separated by indices and cluster deprecations.