Fix NODE_PATH is not being loaded from .env

[igor-dv]

Issue: based on the changes from #4590
Fixes: #4496

1. I've added a NODE_PATH=src into the .env in cra-kitchen-sink
2. Separated the main jest.config.js into examples

[codecov]

Codecov Report

Merging #4706 into next will decrease coverage by 0.02%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##             next    #4706      +/-   ##
==========================================
- Coverage   35.48%   35.45%   -0.03%     
==========================================
  Files         557      557              
  Lines        6747     6752       +5     
  Branches      892      892              
==========================================
  Hits         2394     2394              
- Misses       3887     3892       +5     
  Partials      466      466

Impacted Files	Coverage Δ
lib/core/src/server/config/webpack.config.prod.js	0% <0%> (ø)	⬆️
lib/core/src/server/config/utils.js	0% <0%> (ø)	⬆️
lib/core/src/server/config/webpack.config.dev.js	0% <0%> (ø)	⬆️

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[igor-dv]

Looks like storyshots are not executed now 🤔

[ndelangen]

@igor-dv Is this ready to merge?

[igor-dv]

It's ready, but I've changed a bit the script/test.js, would like to know if it's an acceptable change, or not.
CC @Hypnosphi