Currently the parquet tests cover both new and old dataset implementation. The usage of legacy dataset can be removed from the tests as the legacy ParquetDataset is being deprecated.

See #31529.

Reporter: Alenka Frim / @AlenkaF

Related issues:

• [Python] Deprecate the legacy ParquetDataset custom python-based implementation (requires)

PRs and other links:

• GitHub Pull Request #14031

_{Note: This issue was originally created as ARROW-16481. Please see the migration documentation for further details.}