[BUG]multiple default backup policies error occurred when doing backup for mysql cluster

[tianyue86]

Describe the env
Kubernetes: v1.31.1-aliyun.1
KubeBlocks: 1.0.0-beta.22
kbcli: 1.0.0-beta.9

To Reproduce
Steps to reproduce the behavior:

1. Create apecloud-mysql cluster with yaml below
   myproxy.yaml.txt

2. List instance of the cluster

3. error occurred when doing backup

kbcli cluster backup scale-mjyogv --method xtrabackup --namespace default 
error: cluster "scale-mjyogv" has multiple default backup policies

4. check policy
   k get bp
   NAME BACKUP-REPO STATUS AGE
   mongo-psfzat-mongodb-backup-policy Available 2d21h
   postgres-imsuhd-postgresql-backup-policy Available 4d2h
   scale-mjyogv-etcd-backup-policy Available 114m
   scale-mjyogv-mysql-backup-policy Available 114m

Expected behavior
A clear and concise description of what you expected to happen.

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Additional context
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[wangyelei]

多个组件支持备份 的话，需要让用户指定下组件，然后在过滤backupPolicy。 现在是集群级别过滤的

[github-actions]

This issue has been marked as stale because it has been open for 30 days with no activity