slowly-test: SimpleProducerConsumerTestStreamingDispatcherTest

[poorbarcode]

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• I searched in the issues and found nothing similar.

Motivation

This test run took more than 5 minutes

https://github.com/apache/pulsar/actions/runs/3042908155/jobs/4902070933

Solution

Make the test run faster

Alternatives

No response

Anything else?

No response

Are you willing to submit a PR?

• I'm willing to submit a PR!