[WIP]: add v8.5.5 release notes#21195

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qiancai wants to merge 48 commits intopingcap:masterfrom

qiancai:add-8.5.5-rn-22190

Commits on Dec 16, 2025

Commits on Dec 17, 2025

Commits on Dec 23, 2025

Add three features

authored

Commits on Dec 24, 2025

Commits on Dec 26, 2025

Apply suggestions from code review
hfxsd
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Commits on Dec 29, 2025

Commits on Dec 30, 2025

Commits on Dec 31, 2025

Compatibility changes: add tidb_index_lookup_pushdown_policy
Oreoxmt
authored

Commits on Jan 6, 2026

Add three BR config items and two behavior changes
lilin90
committed