[REVIEW] Adding CodeCov Info for Dask Tests

[mdemoret-nv]

Closes #3171

This PR adjusts the CI build script to generate code coverage output for the dask tests that are run separately from the rest of the cuML tests. Ideally, the codecov CLI will detect this additional output and automatically upload it.

Still a WIP. Testing alternative upload methods for Codecov.io.

[mdemoret-nv]

rerun tests

[mdemoret-nv]

rerun tests

[mdemoret-nv]

rerun tests

[mdemoret-nv]

rerun tests

[mdemoret-nv]

rerun tests

[JohnZed]

Looks good... just a question about the test nn exclusion and some extraneous ann.pyx code that is probably a reflection of a weird merge issue?

[JohnZed]

Ok, looked at the ann.pxd changes - all looks good. We lose the "inline" but these are not so perf critical that we should be concerned.

[mdemoret-nv]

rerun tests

[JohnZed]

@gpucibot merge

[mdemoret-nv]

rerun tests

[codecov-io]

Codecov Report

Merging #3338 (915e1e9) into branch-0.19 (39c7262) will increase coverage by 7.56%.
The diff coverage is 71.72%.

@@               Coverage Diff               @@
##           branch-0.19    #3338      +/-   ##
===============================================
+ Coverage        71.77%   79.33%   +7.56%     
===============================================
  Files              212      225      +13     
  Lines            17075    17946     +871     
===============================================
+ Hits             12256    14238    +1982     
+ Misses            4819     3708    -1111     

Flag	Coverage Δ
dask	44.12% <14.67%> (?)
non-dask	71.62% <69.97%> (?)

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	63.61% <ø> (+0.07%)	⬆️
python/cuml/experimental/explainer/common.py	88.05% <42.85%> (-4.01%)	⬇️
...l/_thirdparty/sklearn/preprocessing/_imputation.py	62.00% <50.00%> (-0.50%)	⬇️
python/cuml/neighbors/nearest_neighbors.pyx	92.43% <50.00%> (-0.29%)	⬇️
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/dask/common/utils.py	43.68% <83.33%> (+16.13%)	⬆️
python/cuml/experimental/explainer/kernel_shap.pyx	97.75% <100.00%> (+0.48%)	⬆️
...n/cuml/experimental/explainer/permutation_shap.pyx	98.82% <100.00%> (+0.84%)	⬆️
... and 72 more

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