GH-46454: [C++][Dataset][Acero] Preserve order when writting with TeeNode #46455
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Rationale for this change
TeeNode needs to sequence batches when implicit order within processed dataset.
What changes are included in this PR?
Conditionally sequence batches when preserve_order=true
Are these changes tested?
I tested it in my use case. No CI tests AFAIK.
Are there any user-facing changes?
Dataset will now be ordered as expected.