no server.request-batch-enable-cross-command in v5.0

[dbsid]

remove the config from v5.0

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[TomShawn]

/label needs-cherry-pick-master
/translation from-docs
This PR is translated from pingcap/docs#5419.

[TomShawn]

/label require-LGT1
/lgtm

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[TomShawn]

/merge

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This pull request has been accepted and is ready to merge.

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Commit hash: 8583349

[ti-srebot]

cherry pick to master in PR #6109