Partial revert of "Direct access to recursive traversal methods"

This reverts the change in EpicsFinder, but leaves the recursive
traversal method definitions.

This partially reverts merge request
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/59095.

ee/app/finders/epics_finder.rb

@@ -164,7 +164,7 @@ class EpicsFinder < IssuableFinder
     elsif include_ancestors
       group.self_and_ancestors
     elsif include_descendants
-      group.recursive_self_and_descendants
+      group.self_and_descendants
     else
       Group.id_in(group.id)
     end