[SPARK-9876][SQL][FOLLOWUP] Enable string and binary tests for Parquet...

[SPARK-9876][SQL][FOLLOWUP] Enable string and binary tests for Parquet predicate pushdown and replace deprecated fromByteArray.

## What changes were proposed in this pull request?

It seems Parquet has been upgraded to 1.8.1 by https://github.com/apache/spark/pull/13280. So,  this PR enables string and binary predicate push down which was disabled due to [SPARK-11153](https://issues.apache.org/jira/browse/SPARK-11153) and [PARQUET-251](https://issues.apache.org/jira/browse/PARQUET-251) and cleans up some comments unremoved (I think by mistake).

This PR also replace the API, `fromByteArray()` deprecated in [PARQUET-251](https://issues.apache.org/jira/browse/PARQUET-251).

## How was this patch tested?

Unit tests in `ParquetFilters`

Author: hyukjinkwon <gurwls223@gmail.com>

Closes #13389 from HyukjinKwon/parquet-1.8-followup.