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PARQUET-2179: [C++][Parquet] Add a test for skipping repeated fields (#14366)

Add a test for `TypedColumnReader::Skip` with repeated values to make it clear that we are skipping values and not records.
Also, add some comments to the existing test for Skip of non-repeated values.

Lead-authored-by: Fatemah Panahi <panahi@google.com>
Co-authored-by: Antoine Pitrou <antoine@python.org>
Co-authored-by: Fatemah Panahi <fatemehp@users.noreply.github.com>
Signed-off-by: Antoine Pitrou <antoine@python.org>