[Bug] Cannot use non-default value for pulsar.service url

### Search before asking

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

### Version

Pulsar 3.1

Tested in both MacOS and Docker-compose

### Minimal reproduce step

Follow the steps in
https://pulsar.apache.org/docs/3.1.x/io-cdc-debezium/#configuration-2

but change pulsar.service.url to something else, e.g. `pulsar://pulsar-server:6650` for docker-compose

### What did you expect to see?

Its is always "pulsar://localhost:6650" no matter what I change the config to…

I can see logs:
2023-09-28T16:31:36,502-0700 [pulsar-client-io-1-3] INFO org.apache.pulsar.client.impl.ConsumerStatsRecorderImpl - Pulsar client config: {"serviceUrl":"pulsar://localhost:6650","authPluginClassName":null,"authParams":null,"authParamMap":null,"operationTimeoutMs":30000,"lookupTimeoutMs":30000,"statsIntervalSeconds":60,"numIoThreads":8,"numListenerThreads":8,"
and
2023-09-28 16:33:46 2023-09-28T23:33:46,136+0000 [pulsar-client-io-1-2] WARN org.apache.pulsar.client.impl.ConnectionPool - Failed to open connection to localhost/:6650 : io.netty.channel.AbstractChannel$AnnotatedConnectException: Connection refused: localhost/127.0.0.1:6650
I need to change the url to something else so that I can work in docker-compose or production.

Thanks!

### What did you see instead?

I had to use `network_mode: host` for now as workaround in https://github.com/xdblab/xdb/pull/25

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start with the Pulsar 3.1.x Debezium connector configuration at the linked documentation and reproduce the issue in Docker Compose using a non-default pulsar.service.url. Trace the configuration value against the client logs; done means the client connects to the configured URL instead of always using pulsar://localhost:6650.

Written by the indexing model from the issue text.