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ARROW-7752: [Release] Enable and test dataset in the verification script

We're not testing the dataset feature in the verifications scripts yet.

Closes #6346 from kszucs/dataset-verification and squashes the following commits:

b8530ea39 <Krisztián Szűcs> Test dataset during the verification

Authored-by: Krisztián Szűcs <szucs.krisztian@gmail.com>
Signed-off-by: Sutou Kouhei <kou@clear-code.com>