Make automatic Node detection work on Windows, and only do it if required

[gjsjohnmurray]

Fixes #959 and make the detection process work correctly on Windows too.

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• [x] Your code builds clean without any errors or warnings
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[codecov[bot]]

Codecov Report

Merging #960 (1f4811f) into dev (37c6ad0) will decrease coverage by 0.00%. The diff coverage is 0.00%.

@@            Coverage Diff             @@
##              dev     #960      +/-   ##
==========================================
- Coverage   10.00%   10.00%   -0.01%     
==========================================
  Files         175      175              
  Lines        5867     5869       +2     
  Branches     1376     1377       +1     
==========================================
  Hits          587      587              
- Misses       5280     5282       +2     

Flag	Coverage Δ
extension	10.00% <0.00%> (-0.01%)	:arrow_down:
formatter	100.00% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
packages/extension/src/language-client/client.ts	0.00% <0.00%> (ø)
.../extension/src/language-client/detect-node-path.ts	0.00% <0.00%> (ø)

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