Almost identical two PysparkBenchReport classes

[jihoonson]

There are currently two PysparkBenchReport classes, one at nds/PysparkBenchReport.py and another at utils/python_benchmark_reporter/PysparkBenchReport.py. These two classes are almost identical with some minor differences. The one in the util directory was created in #187. I'm not sure why we decided to make a copy, but having two almost identical classes increases maintenance cost as in #204. We should rather consolidate them if possible. Or if we want to keep them separate, we should rename one of them.

[jihoonson]

This was not fixed in #211.

[jihoonson]

This is currently blocked as it will impact many of our CI jobs. The current estimation for fixing those CI jobs is a couple of weeks.