improve LSP tests

[acao]

• mockfs strategy
• move parseDocument tests to their own file
• config failure/lifecycle tests

current issue: inline requires in cosmiconfig seem to break fs-mock in weird ways. un-skipping the last test leads to a segfault

[changeset-bot]

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Latest commit: e2179ab

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[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (98af530) 55.74% compared to head (e2179ab) 55.67%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3510      +/-   ##
==========================================
- Coverage   55.74%   55.67%   -0.08%     
==========================================
  Files         114      114              
  Lines        5312     5308       -4     
  Branches     1444     1441       -3     
==========================================
- Hits         2961     2955       -6     
- Misses       1923     1930       +7     
+ Partials      428      423       -5     

Files	Coverage Δ
...aphql-language-service-server/src/parseDocument.ts	100.00% <100.00%> (+13.33%)	⬆️
...l-language-service/src/interface/getDiagnostics.ts	83.87% <ø> (ø)
...hql-language-service-server/src/findGraphQLTags.ts	84.81% <0.00%> (+2.09%)	⬆️
...ql-language-service-server/src/MessageProcessor.ts	45.58% <33.33%> (-0.26%)	⬇️

... and 1 file with indirect coverage changes

[github-actions]

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