[Failing Test]: beam_PostRelease_Python_Candidate script broken

### What happened?

test: https://ci-beam.apache.org/job/beam_PostRelease_Python_Candidate/

This test suite is documented as part of release candidate validation. From the history the last successful run was V2.46.0 rc1; and as of V2.49.0 rc1 it is broken. Error message:

```
18:53:26 ERROR: Failed to create topic [projects/apache-beam-testing/topics/wordstream-python-topic-1]: Resource already exists in the project (resource=wordstream-python-topic-1).
18:54:02 ERROR: (gcloud.pubsub.topics.create) Failed to create the following: [wordstream-python-topic-1].
```

### Issue Failure

Failure: Test is continually failing

### Issue Priority

Priority: 1 (unhealthy code / failing or flaky postcommit so we cannot be sure the product is healthy)

### Issue Components

- [X] Component: Python SDK
- [ ] Component: Java SDK
- [ ] Component: Go SDK
- [ ] Component: Typescript SDK
- [ ] Component: IO connector
- [ ] Component: Beam examples
- [ ] Component: Beam playground
- [ ] Component: Beam katas
- [ ] Component: Website
- [ ] Component: Spark Runner
- [ ] Component: Flink Runner
- [ ] Component: Samza Runner
- [ ] Component: Twister2 Runner
- [ ] Component: Hazelcast Jet Runner
- [ ] Component: Google Cloud Dataflow Runner