Fix ability to run development environment on windows

[cmdcolin]

Tested on a windows vm with plain cmd.exe

Uses a code snippet found in viewstools/yarn-workspaces-cra-crna#28 which manually runs yarn via a spawned process, which replaces the 'get-yarn-workspaces' dependency, which assumed forward slashes

[codecov]

Codecov Report

Merging #3324 (d14ef05) into main (bc6adcb) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3324   +/-   ##
=======================================
  Coverage   59.50%   59.50%           
=======================================
  Files         736      736           
  Lines       28999    28999           
  Branches     7017     7017           
=======================================
  Hits        17257    17257           
  Misses      11496    11496           
  Partials      246      246           

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