BRIE: add experimental notice in BACKUP and RESTORE sql (#15528)#15547

Merged

ti-chi-bot[bot] merged 2 commits intopingcap:release-6.1from ti-chi-bot:cherry-pick-15528-to-release-6.1

Nov 28, 2023

+10-2

Commits on Nov 28, 2023

This is an automated cherry-pick of pingcap#15528

YuJuncen
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ti-chi-bot
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resolve conflicts
Oreoxmt
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