[k8s] clsi-cache tweaks (#30949)

* [k8s] clsi-cache: switch parent-app label to 'clsi-cache-legacy'

* [k8s] clsi-cache: add service account from kustomization.yaml

* [k8s] clsi-cache: consolidate on a single array of CLSI_CACHE_INSTANCES

* [clsi-cache] make prettier happy

GitOrigin-RevId: 4082a71df591904cfe437c4bde74759ddd83634c

services/clsi/config/settings.defaults.cjs

@@ -57,8 +57,10 @@ module.exports = {
       }`,
     },
     clsiCache: {
-      enabled: !!process.env.CLSI_CACHE_SHARDS,
-      shards: JSON.parse(process.env.CLSI_CACHE_SHARDS || '[]'),
+      enabled: !!process.env.CLSI_CACHE_INSTANCES,
+      shards: JSON.parse(process.env.CLSI_CACHE_INSTANCES || '[]').filter(
+        ({ zone }) => zone === process.env.ZONE
+      ),
     },
   },