br: fix backoffer can't handle multierrs (#54084)#54109

Merged

ti-chi-bot[bot] merged 3 commits intopingcap:release-6.5from ti-chi-bot:cherry-pick-54084-to-release-6.5

Sep 4, 2024

+71-1,591

Commits on Jun 19, 2024

This is an automated cherry-pick of pingcap#54084

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Commits on Sep 2, 2024

fix
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lint
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