Fix timeouts loading /admin/projects page

These extra sort keys caused sequential scans on the namespaces and projects
page. Removing them makes the page load on GitLab.com.

Closes #44338

app/finders/admin/projects_finder.rb

@@ -16,8 +16,7 @@ class Admin::ProjectsFinder
     items = by_archived(items)
     items = by_personal(items)
     items = by_name(items)
-    items = sort(items)
-    items.includes(:namespace).order("namespaces.path, projects.name ASC").page(params[:page])
+    sort(items).page(params[:page])
   end
 
   private

changelogs/unreleased/sh-optimize-admin-projects-page.yml

+---
+title: Fix timeouts loading /admin/projects page
+merge_request:
+author:
+type: performance