Antalya 26.8: Add an Antalya-only protocol version advertised in the `ServerHello` - #2473

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zvonand wants to merge 2 commits into

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feature/antalya-26.8/pr-2378

Commits on Oct 1, 2026

Cherry-pick of https://github.com/Altinity/ClickHouse/pull/2378 with unresolved conflict markers (resolution in next commit)
zvonand
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566dd98
Resolve conflicts in cherry-pick of #2378
zvonand
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b856925