Take out python data viz task

[SashaWeinstein]

This change would be to make the data challenge less time intensive to complete. Looking back at the data challenges submitted for the senior data engineer position, some good candidates with good skills didn't finish the challenge. This upgrade would push candidates to spend their limited time on tasks that best assess their ability.

I think the python data viz task could come out entirely. Here are my reasons:

1. Data visualization takes a long time. I always have to google how to set up matplot lib, and spend time on some little detail like axis labels or the legend.
2. Data viz doesn't tell us that much about a candidate's engineering skills. There are few design choices to navigate, no test of a candidate's ability to write intuitive code.
3. We don't do that much data viz. The data viz we do for QAQC (in the app or one-off checks) can be achieved by just following existing patterns

I think the choropleth viz should stay as it tests geospatial skills as well. Plus I like having someone do a similar task in two different languages, makes it faster to complete while still assessing proficiency in languages