cloud: add 20250722 release notes

[qiancai]

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[gemini-code-assist]

Summary of Changes

Hello @qiancai, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request adds the release notes for July 22, 2025, to the TiDB Cloud documentation. The updates cover new configuration options for dedicated clusters, enhancements to the scaling process for improved stability, and a significantly improved user experience for data import into serverless clusters.

Highlights

• New Node Size for TiDB Cloud Dedicated: Introduced a new 32 vCPU, 128 GiB node size for TiDB, TiKV, and TiFlash nodes in TiDB Cloud Dedicated clusters hosted on Google Cloud.
• Improved TiKV Scaling Process: Enhanced the TiKV scaling process for TiDB Cloud Dedicated clusters to improve stability, including automatic internal service capacity checks and user confirmation for expansions.
• Enhanced Data Import for Serverless: Streamlined the cloud storage data import experience for TiDB Cloud Serverless clusters with a new 3-step wizard featuring intelligent pre-checks, file mapping, and bucket scanning, along with new related documentation.

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[gemini-code-assist]

Code Review

This pull request adds release notes for July 22, 2025. The changes look good. I've added a few minor suggestions to improve wording and clarity, in line with the documentation style guide.

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-07-22 05:52:56.94032809 +0000 UTC m=+57533.677754302: ☑️ agreed by Oreoxmt.