Relax validation of environment path variable

[DonJayamanne]

Fixes #2076

• Title summarizes what is changing
• Includes a news entry file (remember to thank yourself!)
• Unit tests & code coverage are 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)
• [N/A] Dependencies are pinned (e.g. "1.2.3", not "^1.2.3")
• [N/A] package-lock.json has been regenerated if dependencies have changed

[d3r3kk]

👍

[codecov]

Codecov Report

Merging #2172 into master will decrease coverage by 0.02%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #2172      +/-   ##
==========================================
- Coverage    79.9%   79.88%   -0.03%     
==========================================
  Files         308      308              
  Lines       14167    14167              
  Branches     2519     2518       -1     
==========================================
- Hits        11320    11317       -3     
- Misses       2835     2838       +3     
  Partials       12       12

Flag	Coverage Δ
#MacOS	73.96% <100%> (+0.04%)	⬆️
#Windows	74.07% <100%> (-0.01%)	⬇️

Impacted Files	Coverage Δ
.../application/diagnostics/checks/envPathVariable.ts	97.72% <100%> (ø)	⬆️
src/client/linters/baseLinter.ts	89.47% <0%> (-1.06%)	⬇️
src/client/debugger/Main.ts	66.91% <0%> (-0.25%)	⬇️
src/client/providers/jediProxy.ts	79.77% <0%> (-0.23%)	⬇️

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