Updated sorter tests to run against multiple sorters where possible.
Updated sorter tests to run against multiple sorters where possible.

Several of the sorter tests, including the benchmarks, were agnostic
to the sorter implementation. These have been updated to run for both
`DRFSorter` and `RandomSorter`. The remainder have been updated to
be called DRFSorter tests.

Review: https://reviews.apache.org/r/67372/

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