[improve][broker]: DelayedDeliveryTracker init and addMessage

### Search before asking

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

### Motivation

1. PersistentDispatcherMultipleConsumers.java use double check lock init DelayedDeliveryTracker
2. PersistentDispatcherMultipleConsumers.java not lock when msgMetadata.hasDeliverAtTime return false
3. InMemoryDelayedDeliveryTracker.java `addMessage` method add lock to ensure thread safe

### Solution

https://github.com/apache/pulsar/pull/17092

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start with PersistentDispatcherMultipleConsumers.java and InMemoryDelayedDeliveryTracker.java, focusing on DelayedDeliveryTracker initialization, msgMetadata.hasDeliverAtTime handling, and addMessage. Review the linked pull request for context, then confirm the three listed concurrency concerns are addressed and covered by the project's relevant checks.

Written by the indexing model from the issue text.