fix: enable search (fix opensearch security, enable es, bump web memory)

- Fix OpenSearch security plugin: change "true" string to true boolean
  in cluster.yaml to actually disable security (TLS + auth)
- Enable elasticsearch in mastodon connecting to shared-os cluster
  (port 9200, TLS disabled, single_node_cluster preset)
- Enable deploySearch hook to build search indexes
- Increase mastodon-web memory limit from 512Mi to 1Gi to fix OOMKill

manifests/opensearch/cluster.yaml

@@ -9,7 +9,7 @@ spec:
     serviceName: shared-os
     setVMMaxMapCount: true
     additionalConfig:
-      plugins.security.disabled: "true"
+      plugins.security.disabled: true
   nodePools:
     - component: nodes
       replicas: 3