exclude lines that are tested in samples

[diondrapeck]

CodeCov by default only considers a line covered if it has a test in the tests/testthat folder, but we have samples that run daily which include functions/objects that aren't included in tests/testthat. Taking that into account will give us a more accurate code coverage number.

[codecov-commenter]

Codecov Report

Merging #389 into master will increase coverage by 10.38%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master     #389       +/-   ##
===========================================
+ Coverage    7.67%   18.05%   +10.38%     
===========================================
  Files          18       14        -4     
  Lines        1042      443      -599     
===========================================
  Hits           80       80               
+ Misses        962      363      -599     

Impacted Files	Coverage Δ
R/run.R	0.00% <0.00%> (ø)
R/compute.R	0.00% <0.00%> (ø)
R/datasets.R	0.00% <0.00%> (ø)
R/keyvault.R	0.00% <0.00%> (ø)
R/workspace.R	0.00% <0.00%> (ø)
R/hyperdrive.R	0.00% <0.00%> (ø)
R/webservice.R	0.00% <0.00%> (ø)
R/webservice-aci.R	0.00% <0.00%> (ø)
R/webservice-local.R	0.00% <0.00%> (ø)
R/do_azureml_parallel.R	0.00% <0.00%> (ø)
... and 6 more

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