chore(kube-prometheus) : we don't need the ceph mixin by default

Signed-off-by: Archisman <archisman@obmondo.com>

Author: Archisman-Mridha

build/kube-prometheus/common-template.jsonnet

@@ -155,7 +155,7 @@ local default_vars = {
     'cert-manager.io/cluster-issuer': 'letsencrypt',
   },
   addMixins: {
-    ceph: true,
+    ceph: false,
     'argo-cd': true,
     'node-pressure': true,
     sealedsecrets: true,