v8.5.5 br: add a new authentication method for Azure (#21206)#21279

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qiancai merged 10 commits intopingcap:feature/preview-v8.5.5from

ti-chi-bot:cherry-pick-21206-to-release-8.5

Jan 14, 2026

Commits on Jan 14, 2026

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update the indention

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Update br/backup-and-restore-storages.md

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minor wording updates

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update the content because AZURE_CLIENT_ID needs to be configured on both TiKV and br

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