show proper error when headers or variables are invalid json

[thomasheyenbrock]

I messed this up in #2453 (which is not published yet), there is no global try-catch anymore, so we need to avoid throwing early.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7ae2d5f

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[github-actions]

The latest changes of this PR are not available as canary, since there are no linked changesets for this PR.

[codecov]

Codecov Report

Merging #2463 (7ae2d5f) into main (2d91916) will increase coverage by 3.40%.
The diff coverage is 57.45%.

@@            Coverage Diff             @@
##             main    #2463      +/-   ##
==========================================
+ Coverage   65.70%   69.11%   +3.40%     
==========================================
  Files          85       71      -14     
  Lines        5106     4190     -916     
  Branches     1631     1402     -229     
==========================================
- Hits         3355     2896     -459     
+ Misses       1747     1290     -457     
  Partials        4        4              

Impacted Files	Coverage Δ
packages/codemirror-graphql/src/hint.ts	94.73% <ø> (ø)
packages/codemirror-graphql/src/lint.ts	100.00% <ø> (ø)
packages/codemirror-graphql/src/results/mode.ts	47.05% <ø> (ø)
...kages/codemirror-graphql/src/utils/forEachState.ts	100.00% <ø> (ø)
packages/codemirror-graphql/src/utils/hintList.ts	95.65% <ø> (ø)
...ckages/codemirror-graphql/src/utils/mode-indent.ts	0.00% <0.00%> (ø)
packages/codemirror-graphql/src/variables/hint.ts	89.70% <ø> (ø)
packages/codemirror-graphql/src/variables/mode.ts	79.48% <ø> (ø)
packages/graphiql-react/src/editor/whitespace.ts	100.00% <ø> (ø)
packages/graphiql-react/src/utility/debounce.ts	0.00% <0.00%> (ø)
... and 90 more

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