fix: toolkit type fixes and doc improvements

[acao]

fixes #1989

• remove subscriptions-transport-ws from the types.ts file, oops!
• re-enable deploy previews with a simple consuming typescript + webpack build so we catch those errors earlier on!
• improve the docs for @graphiql/toolkit createFetcher()
• legacyWsClient makes more sense than legacyClient

[changeset-bot]

⚠️ No Changeset found

Latest commit: c8ebb19

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[codecov]

Codecov Report

Merging #1992 (2bac7b1) into main (2d91916) will increase coverage by 0.75%.
The diff coverage is 70.09%.

❗ Current head 2bac7b1 differs from pull request most recent head c8ebb19. Consider uploading reports for the commit c8ebb19 to get more accurate results

@@            Coverage Diff             @@
##             main    #1992      +/-   ##
==========================================
+ Coverage   65.70%   66.46%   +0.75%     
==========================================
  Files          85       86       +1     
  Lines        5106     5144      +38     
  Branches     1631     1641      +10     
==========================================
+ Hits         3355     3419      +64     
+ Misses       1747     1721      -26     
  Partials        4        4              

Impacted Files	Coverage Δ
...ackages/graphiql-toolkit/src/create-fetcher/lib.ts	51.78% <46.66%> (-7.79%)	⬇️
packages/graphiql/src/utility/HistoryStore.ts	62.26% <62.26%> (ø)
packages/graphiql/src/components/QueryHistory.tsx	73.91% <76.47%> (+6.69%)	⬆️
...iql/src/components/DocExplorer/MarkdownContent.tsx	100.00% <100.00%> (ø)
packages/graphiql/src/components/GraphiQL.tsx	58.34% <100.00%> (+0.83%)	⬆️
...ql-language-service-server/src/MessageProcessor.ts	66.66% <100.00%> (+6.38%)	⬆️
...hql-language-service-server/src/findGraphQLTags.ts	67.64% <100.00%> (+7.00%)	⬆️
...raphql-language-service-server/src/GraphQLCache.ts	52.25% <0.00%> (+0.60%)	⬆️
packages/graphiql/src/utility/QueryStore.ts	42.85% <0.00%> (+2.04%)	⬆️
... and 3 more

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