attempt to get vscode working in an e2e runner

[acao]

this is the closest I can get - if you follow the console log statements through the call stack, we are able to find the extension but not activate it. I then went so far as to disable most of the logic in extension#activate() to no avail - the activate() function is never called! the result is the same when i use the tsc dist instead of the esbuild output, as the extension originally used before merging with the monorepo - the activate() function is never called when ext.activate() is invoked in the test helper

this setup is based on the lsp-sample

going to try some alternative test runners tomorrow, such as vscode-extension-tester, however these don't clearly document how to test LSP functionality

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[github-actions]

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[acao]

made more progress by switching to insiders build, dist, adding fixture files that will trigger activation events, and it worked!
the extension activated, but now the language-service client is causing this error

[dimaMachina]

I added it to test removing unused languages and avoid regressions

[acao]

no worries, this PR will take a long while before it will be stable enough for review even! I expect to do a significant rebase next week

[codecov]

Codecov Report

Merging #3288 (34bf19b) into main (2f15e20) will increase coverage by 0.07%.
The diff coverage is 67.56%.

❗ Current head 34bf19b differs from pull request most recent head 658d7a1. Consider uploading reports for the commit 658d7a1 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3288      +/-   ##
==========================================
+ Coverage   56.40%   56.48%   +0.07%     
==========================================
  Files         109      109              
  Lines        5159     5191      +32     
  Branches     1407     1407              
==========================================
+ Hits         2910     2932      +22     
- Misses       1825     1835      +10     
  Partials      424      424              

Impacted Files	Coverage Δ
...hql-language-service-server/src/findGraphQLTags.ts	82.40% <ø> (ø)
...ql-language-service-server/src/MessageProcessor.ts	47.80% <66.66%> (+1.58%)	⬆️
...raphql-language-service-server/src/GraphQLCache.ts	50.88% <100.00%> (ø)