Fix Milvus object storage secret filter and label

[ArnobKumarSaha]

The Object Storage Config Secret dropdown in kubedbcom-milvus-editor-options was always empty: getSecrets filtered for a config.env data key, which the Milvus object storage secret never contains.

• ui/functions.js — filter on the actual MinIO/S3 config keys (address, port, accessKeyID, secretAccessKey, bucketName). rootPath is left out of the required set since it is an optional path prefix.
• ui/create-ui.yaml — rename the field label Config Secret -> Object Storage Secret.

Matching secret shape:

apiVersion: v1
kind: Secret
metadata:
  name: milvus-storage-config
  namespace: demo
stringData:
  address: "minio.minio.svc.cluster.local"
  port: "9000"
  accessKeyID: "rootuser"
  secretAccessKey: "rootpass123"
  bucketName: "milvus"
  rootPath: "files"

Not addressed here: kubedbcom-milvus-editor never surfaces spec.objectStorage.configSecret.name even though objectStorage is required by the Milvus CRD.