[REVIEW] Enable groupby list aggregation for strings

[shwina]

No description provided.

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[codecov]

Codecov Report

Merging #6914 (a2b25a0) into branch-0.17 (cd7a0ad) will decrease coverage by 0.06%.
The diff coverage is 33.33%.

@@               Coverage Diff               @@
##           branch-0.17    #6914      +/-   ##
===============================================
- Coverage        81.96%   81.89%   -0.07%     
===============================================
  Files               96       97       +1     
  Lines            16231    16169      -62     
===============================================
- Hits             13303    13242      -61     
+ Misses            2928     2927       -1     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/decimal.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/dtypes.py	89.93% <66.66%> (-0.45%)	⬇️
python/cudf/cudf/utils/gpu_utils.py	53.65% <0.00%> (-4.88%)	⬇️
python/cudf/cudf/core/abc.py	87.23% <0.00%> (-4.26%)	⬇️
python/cudf/cudf/utils/utils.py	84.25% <0.00%> (-1.11%)	⬇️
python/cudf/cudf/io/parquet.py	91.66% <0.00%> (-0.46%)	⬇️
python/cudf/cudf/utils/dtypes.py	88.71% <0.00%> (-0.39%)	⬇️
python/cudf/cudf/core/dataframe.py	90.99% <0.00%> (-0.16%)	⬇️
python/cudf/cudf/core/frame.py	89.93% <0.00%> (-0.13%)	⬇️
python/cudf/cudf/core/column/datetime.py	88.44% <0.00%> (-0.12%)	⬇️
... and 13 more

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