[REVIEW] FIX Add codecov upload block to gpu script

[dillon-cullinan]

This moves a block from the Jenkins build into the build script. Simplifies the Jenkins builds slightly and fixes a very rare case where tests may error and not be properly caught due to EXITCODE intricacies.

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[codecov]

Codecov Report

Merging #6860 (b75f6cd) into branch-0.19 (bd537b6) will increase coverage by 0.26%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.19    #6860      +/-   ##
===============================================
+ Coverage        81.92%   82.18%   +0.26%     
===============================================
  Files               96      100       +4     
  Lines            16167    16949     +782     
===============================================
+ Hits             13245    13930     +685     
- Misses            2922     3019      +97     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/methods.py	87.23% <0.00%> (-9.20%)	⬇️
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/io/csv.py	91.66% <0.00%> (-4.08%)	⬇️
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/dask_cudf/dask_cudf/groupby.py	92.15% <0.00%> (-2.90%)	⬇️
python/cudf/cudf/io/orc.py	86.89% <0.00%> (-2.50%)	⬇️
python/dask_cudf/dask_cudf/backends.py	89.85% <0.00%> (-1.45%)	⬇️
python/cudf/cudf/utils/ioutils.py	78.71% <0.00%> (-1.18%)	⬇️
... and 52 more

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[kkraus14]

@dillon-cullinan what's the plan with this PR?

[dillon-cullinan]

@kkraus14 should be good to merge after CI runs.

[kkraus14]

@gpucibot merge