Backups: Relax commit order preservation during restore

[mattlord]

Description

Testing potential restore performance improvements, starting with setting replica_preserve_commit_order=OFF

Related Issue(s)

Checklist

• "Backport to:" labels have been added if this change should be back-ported to release branches
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• Tests were added or are not required
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• Documentation was added or is not required

[vitess-bot]

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