Add note of azure blob storage clickpipe private preview

[kitop]

Summary

We are adding private beta support for azure blob storage in clickpipes

Checklist

• Delete items not relevant to your PR
• URL changes should add a redirect to the old URL via https://github.com/ClickHouse/clickhouse-docs/blob/main/docusaurus.config.js
• If adding a new integration page, also add an entry to the integrations list here: https://github.com/ClickHouse/clickhouse-docs/blob/main/docs/integrations/index.mdx

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	May 16, 2025 11:49am

3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
clickhouse-docs-jp	⬜️ Ignored (Inspect)			May 16, 2025 11:49am
clickhouse-docs-ru	⬜️ Ignored (Inspect)	Visit Preview		May 16, 2025 11:49am
clickhouse-docs-zh	⬜️ Ignored (Inspect)	Visit Preview		May 16, 2025 11:49am

[Blargian]

LGTM. I made one small change to incorporate some of the language suggestions made by Vale linter.