Make max_insert_delayed_streams_for_parallel_write actually work

[alesapin]

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[alesapin]

cc @azat

[robot-ch-test-poll]

This is an automated comment for commit 253a29d52896a2b4ba261fea02639d1f0a467a5c with description of existing statuses. It's updated for the latest CI running

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[azat]

@alesapin you mean that it works differently when the default value of max_insert_delayed_streams_for_parallel_write is different from 0?

[alesapin]

@azat there were just no logic for support_parallel_write in replicated merge tree. It was always false.