SNOW-1897441: Fix missing row position sort in DataFrame.describe

[sfc-gh-joshi]

1. Which Jira issue is this PR addressing? Make sure that there is an accompanying issue to your PR.

   Fixes SNOW-1897441

2. Fill out the following pre-review checklist:

   • I am adding a new automated test(s) to verify correctness of my new code
     • If this test skips Local Testing mode, I'm requesting review from @snowflakedb/local-testing
   • I am adding new logging messages
   • I am adding a new telemetry message
   • I am adding new credentials
   • I am adding a new dependency
   • If this is a new feature/behavior, I'm adding the Local Testing parity changes.
   • I acknowledge that I have ensured my changes to be thread-safe. Follow the link for more information: Thread-safe Developer Guidelines

3. Please describe how your code solves the related issue.

When calling describe on a DataFrame with object columns, pandas will report a top column identifying the value that appears most frequently. If the top two values share the same frequency, pandas documentation indicates that it actually does not provide any stability guarantees:

If multiple object values have the highest count, then the count and top results will be arbitrarily chosen from among those with the highest count.

Tests involving this behavior are currently failing on QA6, where it appears that the order of results returned by a GROUP BY/COUNT query has changed. This PR adds an additional sort on the row position column to ensure that the object value that appears first is always chosen first; this may not always agree with pandas (though pandas does this in all of our current tests), but at least keeps results the same between prod and qa6.

I ran tests/integ/modin/frame/test_describe.py with a qa6 account to verify everything passes.

[sfc-gh-lmukhopadhyay]

LGTM, thanks Jonathan!

[sfc-gh-helmeleegy]

Looks good, thanks Johnathan.