Use ProjectFinder to filter the projects

Instead of trying to do the heavy lifting in the API itself, use the existing
features of the ProjectFinder.

lib/api/helpers.rb

@@ -261,19 +261,6 @@ module API
         projects = projects.merge(current_user.owned_projects)
       end
-      if params[:starred]
-        projects = projects.merge(current_user.starred_projects)
-      end
-
-      if params[:search].present?
-        projects = projects.search(params[:search])
-      end
-
-      if params[:visibility].present?
-        projects = projects.search_by_visibility(params[:visibility])
-      end
-
-      projects = projects.where(archived: params[:archived])
       projects.reorder(params[:order_by] => params[:sort])
     end

lib/api/projects.rb

@@ -70,6 +70,10 @@ module API
         def present_projects(options = {})
           finder_params = {}
           finder_params[:non_public] = true if params[:membership].present?
+          finder_params[:starred] = true if params[:starred].present?
+          finder_params[:visibility_level] = Gitlab::VisibilityLevel.level_value(params[:visibility]) if params[:visibility]
+          finder_params[:archived] = params[:archived]
+          finder_params[:search] = params[:search] if params[:search]
           projects = ProjectsFinder.new(current_user: current_user, params: finder_params).execute
           projects = filter_projects(projects)