Replace KibanaServices singleton with useKibana hook

[tiansivive]

In /x-pack/plugins/security_solution/public/entity_analytics/api/api.ts, the fetch calls should be updated to use the useKibana Hook

This was originally pointed out here

This implies carefully restructuring the call sites, as there's no guarantees that they're all within hooks already.
For example, they could be called onClick event handlers or as part of the queryFn for react-query.

https://github.com/tiansivive/kibana/blob/b18a7aeecf160ea4fd60892f6a1768b4466da6c4/x-pack/plugins/security_solution/public/entity_analytics/api/api.ts#L32