Pulsar topic auto deletion not work

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/pulsar/issues) and found nothing similar.

### Read release policy

- [X] I understand that unsupported versions don't get bug fixes. I will attempt to reproduce the issue on a supported version of Pulsar client and Pulsar broker.

### Version

Version 2.0

### Minimal reproduce step

1.Edit pulsar broker.conf, add the following items:
```markdown
brokerDeleteInactiveTopicsEnabled: true
brokerDeleteInactiveTopicsMode: delete_when_no_subscriptions
brokerDeleteInactiveTopicsMaxInactiveDurationSeconds: 600
```

2. Restart Pulsar broker

3. Add a topic with no subscriptions

4. After 600s, we can still query the topic by using admin API

### What did you expect to see?

The topic can be deleted

### What did you see instead?

The topic still exists

### Anything else?

_No response_

### Are you willing to submit a PR?

- [X] I'm willing to submit a PR!

Start by reproducing the behavior with the broker.conf settings and the no-subscription topic steps, then inspect the broker's inactive-topic deletion path and the admin API result. Confirm whether a topic configured with delete_when_no_subscriptions is removed after 600 seconds, and add regression coverage for the observed behavior.

Written by the indexing model from the issue text.