cloud: add cloud release notes for release-20260721

[doc-claw-bot]

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

Add the July 21, 2026 TiDB Cloud external release notes entry for TiDB Cloud Essential.
Preserve the reviewed Feishu wording and convert eligible TiDB Cloud docs links to repo-style links.

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

• v8.5

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

• Source doc: https://pingcap.feishu.cn/wiki/XBRDwEEsJiNSUGkCgJ4cPuTVn4b

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

Summary by CodeRabbit

• New Features

  • TiDB Cloud Essential’s Top RU public preview now supports the Alibaba Cloud Jakarta region (ap-southeast-5).
  • Added release notes (July 21, 2026) with minute-level visibility into Top RU–consuming SQL statements.

• Documentation

  • Updated the Table of Contents labeling for Top RU as a preview feature in both Essential and Premium documentation.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Pro

Run ID: 8734bc46-7581-4532-a566-58a529176778

📥 Commits

Reviewing files that changed from the base of the PR and between d68832b and b333a20.

📒 Files selected for processing (1)

• TOC-tidb-cloud-premium.md

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📝 Walkthrough

Walkthrough

Top RU is marked as a public preview feature in the TiDB Cloud Essential and Premium TOCs. Release notes document Alibaba Cloud Jakarta support and minute-level visibility into Top RU-consuming SQLs.

Changes

Top RU preview

Layer / File(s)	Summary
Top RU preview documentation TOC-tidb-cloud-essential.md, TOC-tidb-cloud-premium.md, tidb-cloud/releases/tidb-cloud-release-notes.md	The TOCs add preview markers to Top RU, while the July 21, 2026 release notes document Jakarta region support and minute-level Top RU-consuming SQL visibility.

Estimated code review effort: 1 (Trivial) | ~3 minutes

Suggested labels: type/enhancement

Suggested reviewers: huoyao1125, qqqdan

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding the TiDB Cloud release notes for release-20260721.
Description check	✅ Passed	The description covers the change, affected version, source link, and checklist items required by the template.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ti-chi-bot]

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-07-21 10:44:00.341597357 +0000 UTC m=+1315226.377692423: ☑️ agreed by lilin90.