[Feature]: When no binlog is backed up, the result of the backup operation should be set to fail

[zhuwenxing]

Is your feature request related to a problem? Please describe.

see https://github.com/zilliztech/milvus-backup/issues/45

The current backup operation does not have a binlog but will show a warning log, but the result will still be success, this backup is meaningless because the restored collection will be empty. This success result will be misleading to the user.

Describe the solution you'd like.

No response

Describe an alternate solution.

No response

Anything else? (Additional Context)

No response