Fix missing clone overrides on derived aggregations

[jlowe]

Fixes #6891

Adds missing clone() overrides on aggregations that are derived but do not use derived_aggregation.

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[harrism]

Thanks for the fix.

[mythrocks]

Good catch, this.

[codecov]

Codecov Report

Merging #6898 (55d1e14) into branch-0.17 (e01ab96) will decrease coverage by 0.35%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.17    #6898      +/-   ##
===============================================
- Coverage        82.31%   81.96%   -0.36%     
===============================================
  Files               93       96       +3     
  Lines            15358    16231     +873     
===============================================
+ Hits             12642    13303     +661     
- Misses            2716     2928     +212     

Impacted Files	Coverage Δ
python/cudf/cudf/benchmarks/bench_cudf_io.py	30.61% <0.00%> (-12.25%)	⬇️
python/cudf/cudf/io/orc.py	88.40% <0.00%> (-9.22%)	⬇️
python/cudf/cudf/utils/ioutils.py	78.71% <0.00%> (-7.40%)	⬇️
python/cudf/cudf/io/json.py	96.55% <0.00%> (-3.45%)	⬇️
python/cudf/cudf/io/avro.py	78.57% <0.00%> (-3.25%)	⬇️
python/cudf/cudf/io/csv.py	94.00% <0.00%> (-1.00%)	⬇️
python/dask_cudf/dask_cudf/core.py	73.68% <0.00%> (-0.67%)	⬇️
python/cudf/cudf/core/column/string.py	86.30% <0.00%> (-0.59%)	⬇️
python/cudf/cudf/core/column/numerical.py	94.53% <0.00%> (-0.46%)	⬇️
python/dask_cudf/dask_cudf/io/parquet.py	91.07% <0.00%> (-0.29%)	⬇️
... and 29 more

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[karthikeyann]

Great catch.