Antalya 26.3: Add OAuth2 login to clickhouse-client (--login / --login=device)#1749

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zvonand wants to merge 2 commits intoantalya-26.3from

feature/antalya-26.3/pr-1606

Commits on May 6, 2026

Cherry-pick of https://github.com/Altinity/ClickHouse/pull/1606 with unresolved conflict markers (resolution in next commit)
zvonand
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Resolve conflicts in cherry-pick of #1606
zvonand
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