Metadatastore etcd support test with url and not testcontainers

### Search before asking

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

### Motivation

Test metadata store etcd with url and not testcontainers.

### Solution

_No response_

### Alternatives

_No response_

### Anything else?

_No response_

### Are you willing to submit a PR?

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

Start by locating the existing metadata-store etcd test and the Testcontainers setup in the repository. Trace how the test currently obtains its etcd endpoint, then determine how a URL-based configuration should be exercised without Testcontainers. Done means the etcd support test runs against a configured URL and no longer depends on Testcontainers.

Written by the indexing model from the issue text.