prod: remove sprayproxy from host clusters (#8385)

We no longer need sprayproxy on the production host cluster, so this is
safe to remove.

Removal of the sprayproxy component itself will come in a follow-up PR.

Part-of: KFLUXINFRA-2240

Signed-off-by: Andy Sadler <[email protected]>

Author: sadlerap

argo-cd-apps/overlays/konflux-public-production/delete-applications.yaml

@@ -30,3 +30,9 @@ kind: ApplicationSet
 metadata:
   name: squid
 $patch: delete
+---
+apiVersion: argoproj.io/v1alpha1
+kind: ApplicationSet
+metadata:
+  name: sprayproxy
+$patch: delete