Produce-only requests should be able to use all worker nodes when using distributed workers

[travisdowns]

Currently if you specify a "no consume" workload (e.g., with 0 subscriptions per topic) it will still allocate 1/2 (rounded up) of all worker nodes to consumer workers, even though consumers will not be started.

Instead, we should allocate all nodes to producers.

[merlimat]

Yes, it does make a lot of sense to make that improvement. The current logic, was to try to keep producer/consumers separated to make it easier to implement, although it's not really the best strategy.

[stale]

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