premium: add Identify Slow Queries to TOC-tidb-cloud-premium

[hfxsd]

…9546)

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[gemini-code-assist]

Code Review

This pull request updates the Table of Contents for TiDB Cloud Premium by renaming the performance analysis section and adding a new entry for identifying slow queries. A review comment suggests adjusting the capitalization of these new entries to sentence case to comply with the project's style guide.

[qiancai]

Rest LGTM

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[LGTM Timeline notifier]

Timeline:

• 2026-04-14 10:09:38.869461455 +0000 UTC m=+1469384.074821502: ☑️ agreed by qiancai.

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