Remove explicit initialization of PYTHONPATH with workspace for dbg test

[DonJayamanne]

Fixes #1465

This pull request:

• Has a title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Has unit tests & code coverage is not adversely affected (within reason)
• Works on all actively maintained versions of Python (e.g. Python 2.7 & the latest Python 3 release)
• Works on Windows 10, macOS, and Linux (e.g. considered file system case-sensitivity)

[d3r3kk]

Looks fine. I've added a single 'Nit' that you can feel free to ignore.

[d3r3kk]

Not important at all, but can we fix the typo in this function name while we are at it, or will that break stuff?

buildLaunc_h_Args

[d3r3kk]

Could we make a constant for the env['PYTHONPATH'] to lose the tslint-disable line?

[codecov]

Codecov Report

Merging #1576 into master will decrease coverage by 0.22%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1576      +/-   ##
==========================================
- Coverage   71.65%   71.42%   -0.23%     
==========================================
  Files         273      273              
  Lines       12700    12700              
  Branches     2282     2282              
==========================================
- Hits         9100     9071      -29     
- Misses       3465     3494      +29     
  Partials      135      135

Impacted Files	Coverage Δ
src/client/linters/errorHandlers/notInstalled.ts	33.33% <0%> (-61.12%)	⬇️
src/client/linters/errorHandlers/errorHandler.ts	77.77% <0%> (-22.23%)	⬇️
src/client/common/logger.ts	53.33% <0%> (-20.01%)	⬇️
src/client/common/application/applicationShell.ts	23.07% <0%> (-7.7%)	⬇️
src/client/common/installer/productInstaller.ts	60.31% <0%> (-4.24%)	⬇️
src/client/linters/baseLinter.ts	88.54% <0%> (-3.13%)	⬇️

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