tiup: use tibd operator to rollback tidb

[hfxsd]

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[JasonWu0506]

if there is only 1 tidb, rollback will break all the connection from client, which means custoemr's app will be down. if multi-instances of tidb, there should be no down.
please doc team review the wording

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[Oreoxmt]

Please update the base branch for this PR from master to release-1.x, as release-1.x is now the active development branch for TiDB Operator v1.x documentation.