Fixes for Jest on Windows

[Daniel15]

• Upgrade Lerna. Lerna 2.0 beta 24 has known issues in Windows: It appears to run successfully but actually doesn't do anything (lerna bootstrap fails with "-4058" lerna/lerna#226 (comment)). Need to upgrade to beta 26 to get an actual working version.
• The regex in package.json wasn't working correctly for some reason. Moving the \ to the right spot (before the .) fixed it. (6c76202)
• SearchSource was incorrectly escaping \ characters in the file path. To avoid this, we convert the \ to / before running escapeStrForRegex. replacePathSepForRegex (which is what pathToRegex calls) converts it back to the correct separator anyways.

Fixes #1462

[codecov-io]

Current coverage is 63.21% (diff: 16.66%)

Merging #1463 into master will decrease coverage by 0.08%

@@             master      #1463   diff @@
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  Files            96         96          
  Lines          3608       3613     +5   
  Methods           0          0          
  Messages          0          0          
  Branches          0          0          
==========================================
  Hits           2284       2284          
- Misses         1324       1329     +5   
  Partials          0          0          

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[Daniel15]

cc @cpojer - The SearchSource change broke Windows support between 14.1.0 and master, and thus should be considered launch blocking for the next release.

[cpojer]

thank you <3

[github-actions]

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