Move `resolve_discussions_with_issue` to `Issues::CreateService`

app/services/issues/create_service.rb

@@ -25,6 +25,15 @@ module Issues
       resolve_discussions_with_issue(issuable)
     end
 
+    def resolve_discussions_with_issue(issue)
+      return if discussions_to_resolve.empty?
+
+      Discussions::ResolveService.new(project, current_user,
+                                      merge_request: merge_request_for_resolving_discussions,
+                                      follow_up_issue: issue).
+        execute(discussions_to_resolve)
+    end
+
     private
 
     def user_agent_detail_service

app/services/issues/resolve_discussions.rb

@@ -7,15 +7,6 @@ module Issues
       @discussion_to_resolve_id ||= params.delete(:discussion_to_resolve)
     end
 
-    def resolve_discussions_with_issue(issue)
-      return if discussions_to_resolve.empty?
-
-      Discussions::ResolveService.new(project, current_user,
-                                      merge_request: merge_request_for_resolving_discussions,
-                                      follow_up_issue: issue).
-        execute(discussions_to_resolve)
-    end
-
     def merge_request_for_resolving_discussions
       @merge_request_for_resolving_discussions ||= MergeRequestsFinder.new(current_user, project_id: project.id).
                                                      execute.