Update TestingFrameworks.md

[ryanrw]

Summary

I added GatsbyJS test with Jest link for someone who visited this page and want to learn more about how GatsbyJS and Jest work.

Test plan

No test need for this edited.

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[codecov-io]

Codecov Report

Merging #8363 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #8363   +/-   ##
=======================================
  Coverage   62.27%   62.27%           
=======================================
  Files         266      266           
  Lines       10728    10728           
  Branches     2609     2608    -1     
=======================================
  Hits         6681     6681           
  Misses       3462     3462           
  Partials      585      585

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[SimenB]

Thanks! Could you also update the versioned docs?

[ryanrw]

@SimenB Thanks for your help with this pull req.

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