Add watchAll flag to jest-editor-support

[k15a]

Summary

I am trying to integrate jest-editor-support into a project which does not have source controll. AFAIK the watch mode of jest needs to run in a git repository to work. This PR will add a watchAll flag which will work in other projects as well.

[codecov-io]

Codecov Report

Merging #5523 into master will decrease coverage by <.01%.
The diff coverage is 66.66%.

@@            Coverage Diff             @@
##           master    #5523      +/-   ##
==========================================
- Coverage   61.69%   61.68%   -0.01%     
==========================================
  Files         213      213              
  Lines        7143     7144       +1     
  Branches        4        4              
==========================================
  Hits         4407     4407              
- Misses       2735     2736       +1     
  Partials        1        1

Impacted Files	Coverage Δ
packages/jest-editor-support/src/Runner.js	67.08% <66.66%> (-0.87%)	⬇️

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[orta]

Yep, seems like a reasonable addition to me 👍

[github-actions]

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