[bug][java-client] Client creation fails with enableTransactions=true if topic transaction_coordinator_assign has not been created yet

**Describe the bug**
Client creation fails with enableTransactions=true if topic transaction_coordinator_assign has not been created yet

```
Caused by: org.apache.pulsar.client.api.transaction.TransactionCoordinatorClientException: org.apache.pulsar.client.api.PulsarClientException$BrokerMetadataException: {"errorMsg":"Namespace not found","reqId":3642126209754600375, "remote":"localhost/127.0.0.1:54629", "local":"/127.0.0.1:54823"}
at app//org.apache.pulsar.client.api.transaction.TransactionCoordinatorClientException.unwrap(TransactionCoordinatorClientException.java:131)
at app//org.apache.pulsar.client.api.transaction.TransactionCoordinatorClientException.unwrap(TransactionCoordinatorClientException.java:129)
at app//org.apache.pulsar.client.impl.transaction.TransactionCoordinatorClientImpl.start(TransactionCoordinatorClientImpl.java:70)
at app//org.apache.pulsar.client.impl.PulsarClientImpl.(PulsarClientImpl.java:204)
... 47 more
```

I found this while enabling transactions on Pulsar standalone but it could apply also in a real cluster.

**To Reproduce**
- Start Pulsar standalone with transactions enabled (see [this pull](https://github.com/testcontainers/testcontainers-java/pull/5479) for reference
- Create a client suddenly after Pulsar is ready (but the topic doesn't exist yet)

**Expected behavior**
The client should work out of the box without throwing exceptions.
Perhaps an infinite backoff retry with severe logging could be a good solution.

**Additional context**
All the Pulsar versions

Reproduce the failure with standalone transactions enabled and a client created before transaction_coordinator_assign exists. Start at TransactionCoordinatorClientImpl.start and the PulsarClientImpl constructor shown in the stack trace; the client should start successfully while the topic is still absent, with the eventual retry behavior and logging defined by the implementation.

Written by the indexing model from the issue text.