Support React.Suspense in snapshots.

[scotthovestadt]

Summary

Resolves #8178

The ReactElement is not aware of the React.Suspense component type, and as a result it causes snapshots to display "UNDEFINED". Fortunately it looks like this serializer is built on top of react-is which already exports a isSuspense so it should hopefully be easy to add this. 😄

Test plan

• Added unit test. Verified that it failed previously with UNDEFINED as described in the bug report. It now passes.

[SimenB]

Nice!

[codecov-io]

Codecov Report

Merging #8180 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8180      +/-   ##
==========================================
+ Coverage   62.33%   62.33%   +<.01%     
==========================================
  Files         265      265              
  Lines       10465    10467       +2     
  Branches     2543     2543              
==========================================
+ Hits         6523     6525       +2     
  Misses       3359     3359              
  Partials      583      583

Impacted Files	Coverage Δ
packages/pretty-format/src/plugins/ReactElement.ts	86.48% <100%> (+0.77%)	⬆️

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[github-actions]

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