[REVIEW] FIX Fix EXITCODE override in test_notebooks script

[dillon-cullinan]

This script used to override the EXITCODE trap in gpu/build.sh causing failures in anything ran before the notebooks to be missed. Renaming the variable will avoid this problem in the future.

Closes: #3207

[GPUtester]

Please update the changelog in order to start CI tests.

View the gpuCI docs here.

[JohnZed]

LGTM

[codecov-io]

Codecov Report

Merging #3208 (5afb4f7) into branch-0.17 (63c8a44) will decrease coverage by 0.04%.
The diff coverage is n/a.

@@               Coverage Diff               @@
##           branch-0.17    #3208      +/-   ##
===============================================
- Coverage        70.99%   70.95%   -0.05%     
===============================================
  Files              198      198              
  Lines            15729    15740      +11     
===============================================
+ Hits             11167    11168       +1     
- Misses            4562     4572      +10     

Impacted Files	Coverage Δ
python/cuml/dask/neighbors/kneighbors_regressor.py	29.85% <0.00%> (-1.40%)	⬇️
...ython/cuml/dask/neighbors/kneighbors_classifier.py	21.29% <0.00%> (-0.71%)	⬇️

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