[Improve] Set dlq producerName

[crossoverJie]

Motivation

To keep consistent with the Java client.

Releted PR: apache/pulsar#21589

Explain here the context, and why you're making that change. What is the problem you're trying to solve.

Modifications

Set DLQ producerName %s-%s-DLQ

Verifying this change

• Make sure that the change passes the CI checks.

Does this pull request potentially affect one of the following parts:

If yes was chosen, please highlight the changes

• Dependencies (does it add or upgrade a dependency): (no)
• The public API: (no)
• The schema: (no)
• The default values of configurations: (yes)
• The wire protocol: (no)

Documentation

• Does this pull request introduce a new feature? (no)
• If yes, how is the feature documented? (not documented)
• If a feature is not applicable for documentation, explain why?
• If a feature is not documented yet in this PR, please create a followup issue for adding the documentation

[RobertIndie]

LGTM. Thanks.