[Bug] Promethus metric duplication in case of using functionsWorker

### Search before asking

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

### Version

Ubuntu 20.04
Pulsar 2.10.4

### Minimal reproduce step

Setting up Debezium source via example doc
https://pulsar.apache.org/docs/2.10.x/io-cdc-debezium/#example-of-postgresql

- enable `functionsWorkerEnabled` in `broker.conf`
- instead of `localrun` use `pulsar-admin source create`
- check metrics duplication `curl http://127.0.0.1:8080/metrics/ | grep jvm_classes_loaded` or `curl http://127.0.0.1:8080/metrics/ | grep process_cpu_seconds_total`

### What did you expect to see?

Prometheus metrics from pulsar server are valid w/o duplication

### What did you see instead?

```
error reading metrics for "http://127.0.0.1:8080/metrics/": reading text format failed: text format parsing error in line 328:
second TYPE line for metric name "process_cpu_seconds_total", or TYPE reported after samples

error reading metrics for "http://127.0.0.1:8080/metrics/": reading text format failed: text format parsing error in line 331:
second TYPE line for metric name "jvm_classes_loaded", or TYPE reported after samples
```

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start with the Debezium PostgreSQL example and the functionsWorkerEnabled setting in broker.conf, then reproduce using pulsar-admin source create rather than localrun. Inspect the /metrics/ endpoint with the provided curl commands and compare the duplicate process_cpu_seconds_total and jvm_classes_loaded output. Done means Prometheus accepts the metrics without duplicate TYPE declarations.

Written by the indexing model from the issue text.