What happened?

The Kuberenetes example test, performed by A2ACloudExampleClient, from #393 sends 8 messages in total which should be load balanced. However, in rare cases all messages go to one pod, leading to the test to fail on CI.
It would be good to be able to configure PROCESS_MESSAGE_COUNT via an env var, and set this to a higher number on CI.
Also, to not make the test take forever, it could break out of the loop once two separate pods have been hit. There won't be more pods, so for CI knowing two have been hit is good enough.

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