premium: add Identify Slow Queries to TOC-tidb-cloud-premium#22753

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hfxsd wants to merge 2 commits intopingcap:release-8.5from

hfxsd:add-Identify-Slow-Queries-to-premium-toc

Commits on Apr 14, 2026

Update TOC-tidb-cloud-premium.md
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Commits on Apr 15, 2026

Update TOC-tidb-cloud-premium.md

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