Improve code coverage reporting

[IvanGoncharov]

No description provided.

[codecov-io]

Codecov Report

Merging #1689 into master will decrease coverage by 1.16%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1689      +/-   ##
==========================================
- Coverage   98.91%   97.75%   -1.17%     
==========================================
  Files         215      215              
  Lines       11604    13164    +1560     
  Branches        0     1960    +1960     
==========================================
+ Hits        11478    12868    +1390     
- Misses        126      193      +67     
- Partials        0      103     +103

Impacted Files	Coverage Δ
src/jsutils/nodejsCustomInspectSymbol.js	66.66% <0%> (-33.34%)	⬇️
src/jsutils/defineToStringTag.js	80% <0%> (-20%)	⬇️
src/jsutils/defineToJSON.js	85.71% <0%> (-14.29%)	⬇️
src/error/formatError.js	90% <0%> (-10%)	⬇️
src/utilities/typeFromAST.js	90.9% <0%> (-9.1%)	⬇️
src/jsutils/instanceOf.js	80% <0%> (-8.89%)	⬇️
src/subscription/mapAsyncIterator.js	81.25% <0%> (-8.75%)	⬇️
src/utilities/isValidJSValue.js	25% <0%> (-8.34%)	⬇️
src/language/predicates.js	51.85% <0%> (-8.15%)	⬇️
src/utilities/findDeprecatedUsages.js	92% <0%> (-8%)	⬇️
... and 166 more

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