Include untouched Apex classes & triggers in package coverage calculation

[aly76]

Fixes #556

[codecov-commenter]

Codecov Report

Merging #560 (c3f2dc6) into develop (0478f6d) will decrease coverage by 12.43%.
The diff coverage is 48.05%.

@@             Coverage Diff              @@
##           develop     #560       +/-   ##
============================================
- Coverage    76.05%   63.62%   -12.44%     
============================================
  Files           39       35        -4     
  Lines         1370     1325       -45     
  Branches       248      233       -15     
============================================
- Hits          1042      843      -199     
- Misses         328      482      +154     

Impacted Files	Coverage Δ
...ackages/core/src/commandExecutor/ExecuteCommand.ts	9.09% <ø> (ø)
packages/core/src/git/GitTags.ts	100.00% <ø> (ø)
packages/core/src/stats/SFPStatsSender.ts	8.06% <ø> (ø)
packages/core/src/artifacts/ArtifactMigrator.ts	10.44% <5.00%> (+2.55%)	⬆️
packages/core/src/package/PackageTestCoverage.ts	58.67% <40.67%> (-18.25%)	⬇️
packages/core/src/logger/SFPLogger.ts	48.93% <48.93%> (ø)
...ages/core/src/artifacts/ArtifactFilePathFetcher.ts	30.18% <75.00%> (ø)
.../core/src/sfpcommands/apextest/TriggerApexTests.ts	21.68% <80.00%> (-73.38%)	⬇️
packages/core/src/SFDXCommand.ts	100.00% <100.00%> (ø)
...src/artifacts/ArtifactInstallationStatusUpdater.ts	100.00% <100.00%> (ø)
... and 16 more

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