test: Add tests for open issues

[lukemanley]

Tests added for the following open issues that appear to already be fixed:

closes #2732
closes #6968
closes #7737
closes #9461
closes #12950
closes #13759
closes #15014
closes #17006

These open issues also appear to be fixed and already have tests. Just noting the existing tests in order to close these issues:

closes #9383 - test_rolling_fixed.py::test_rolling_var_stability_12905
closes #11194 - test_decimal.py::test_df_constructor_convert_decimal_to_float_9873

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.64%. Comparing base (24fccc4) to head (6b8feb2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #20857      +/-   ##
==========================================
- Coverage   79.64%   79.64%   -0.01%     
==========================================
  Files        1571     1571              
  Lines      223156   223156              
  Branches     2546     2546              
==========================================
- Hits       177731   177730       -1     
- Misses      44841    44842       +1     
  Partials      584      584              

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