fix: add app icon and statusInformers for Tier 4

- icon: game controller SVG for EC installer display (rubric 4.6)
- statusInformers: add postgresql and redis statefulsets (rubric 2.10)

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: aa-replicated

kots-app.yaml

@@ -4,5 +4,8 @@ metadata:
   name: gameshelf
 spec:
   title: GameShelf
+  icon: https://upload.wikimedia.org/wikipedia/commons/thumb/4/4a/Classic_Game_Controller_Icon.svg/240px-Classic_Game_Controller_Icon.svg.png
   statusInformers:
     - deployment/gameshelf
+    - statefulset/gameshelf-postgresql
+    - statefulset/gameshelf-redis-master