add plugins to webpack dev bundle

[acao]

this will complete #3374 and make it much easier to test #3346,

furthermore, this allows us to add standalone e2e tests for the plugin, that can run off the same e2e setup used by the graphiql project

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2794756

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[codecov]

Codecov Report

Merging #3403 (2794756) into main (2348641) will increase coverage by 0.10%.
Report is 8 commits behind head on main.
The diff coverage is 98.38%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3403      +/-   ##
==========================================
+ Coverage   55.75%   55.85%   +0.10%     
==========================================
  Files         110      110              
  Lines        5243     5256      +13     
  Branches     1426     1432       +6     
==========================================
+ Hits         2923     2936      +13     
  Misses       1897     1897              
  Partials      423      423              

Files Changed	Coverage Δ
...nguage-service/src/utils/getVariablesJSONSchema.ts	94.59% <98.38%> (+0.71%)	⬆️