Add 26.4 Cloud release notes#6351

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Blargian wants to merge 3 commits into

ClickHouse:mainfrom

Blargian:cloud-release-notes-26-4

Commits on Jun 5, 2026

Add 26.4 Cloud release notes

Blargian
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claude
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Commits on Jun 9, 2026

Merge branch 'main' of https://github.com/ClickHouse/clickhouse-docs into cloud-release-notes-26-4
Blargian
committed
Merge main into branch and update index
Blargian
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