Add flexibility to copyright checker

[lowener]

Follow-up to #3453 to expose the file excluder through command-line arguments.

[mdemoret-nv]

Changes look good. Two small suggestions. Approving assuming those suggestions get resolved.

[mdemoret-nv]

The error handling is a good improvement, but it doesnt actually take any action when there is an error. I feel like it should immediately return if there is an exception in the regular expression.

[mdemoret-nv]

Everything looks good.

[codecov-io]

Codecov Report

Merging #3466 (8419ba6) into branch-0.19 (39c7262) will increase coverage by 9.00%.
The diff coverage is 72.34%.

@@               Coverage Diff               @@
##           branch-0.19    #3466      +/-   ##
===============================================
+ Coverage        71.77%   80.77%   +9.00%     
===============================================
  Files              212      225      +13     
  Lines            17075    17617     +542     
===============================================
+ Hits             12256    14231    +1975     
+ Misses            4819     3386    -1433     

Flag	Coverage Δ
dask	45.17% <15.78%> (?)
non-dask	72.97% <70.86%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...on/cuml/_thirdparty/sklearn/preprocessing/_data.py	63.24% <ø> (-0.30%)	⬇️
python/cuml/experimental/explainer/common.py	88.05% <42.85%> (-4.01%)	⬇️
python/cuml/neighbors/ann.pyx	61.62% <61.62%> (ø)
python/cuml/common/import_utils.py	59.43% <66.66%> (+3.43%)	⬆️
python/cuml/experimental/explainer/base.pyx	67.06% <67.06%> (ø)
python/cuml/metrics/hinge_loss.pyx	73.33% <73.33%> (ø)
python/cuml/neighbors/nearest_neighbors.pyx	92.40% <75.00%> (-0.31%)	⬇️
python/cuml/dask/common/utils.py	43.68% <83.33%> (+16.13%)	⬆️
...l/_thirdparty/sklearn/preprocessing/_imputation.py	62.80% <100.00%> (+0.29%)	⬆️
python/cuml/experimental/explainer/kernel_shap.pyx	97.75% <100.00%> (+0.48%)	⬆️
... and 103 more

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[dantegd]

@gpucibot merge