cloud: add cloud release notes for release-20260609

[doc-claw-bot]

What is changed, added, or deleted? (Required)

Add TiDB Cloud release notes for June 9, 2026 (release-20260609).

Which TiDB version(s) do your changes apply to? (Required)

• v8.5

What is the related PR or file link(s)?

None

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

[ti-chi-bot]

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[ti-chi-bot]

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[gemini-code-assist]

Code Review

This pull request adds the TiDB Cloud release notes for June 9, 2026, covering a new AWS region for full-text search on TiDB Cloud Starter, high availability deployment changes for TiDB Cloud Essential, and new backup API endpoints for TiDB Cloud Premium. The review feedback focuses on improving documentation quality by ensuring consistent terminology (such as using 'N. Virginia' and 'Recycle Bin') and avoiding passive voice to enhance readability.

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-06-09 08:12:01.773703741 +0000 UTC m=+861222.844021121: ☑️ agreed by lilin90.