chore: migrate to new prow reviewing

[wuhuizuo]

• Backgroup: https://internals.tidb.io/t/topic/854
• Ref: https://github.com/ti-community-infra/configs/issues/824

Signed-off-by: wuhuizuo wuhuizuo@126.com

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[wuhuizuo]

/hold should merge it when bot configuration was updated.

[wuhuizuo]

/unhold