Remove the test-cra example app.

[tmeasday]

No longer needed, we can now test cra-kitchen-sink

Issue:

test-cra is redundant

What I did

Removed it and all references to it

How to test

Let's just ensure the build still works.

[codecov]

Codecov Report

Merging #1706 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1706   +/-   ##
=======================================
  Coverage   21.22%   21.22%           
=======================================
  Files         252      252           
  Lines        5706     5706           
  Branches      690      685    -5     
=======================================
  Hits         1211     1211           
+ Misses       3962     3960    -2     
- Partials      533      535    +2

Impacted Files	Coverage Δ
app/react/src/server/config/babel.js	0% <0%> (-100%)	⬇️
app/react/src/server/babel_config.js	0% <0%> (-83.88%)	⬇️
app/vue/src/server/utils.js	0% <0%> (-32.15%)	⬇️
addons/knobs/src/components/types/Object.js	5.81% <0%> (ø)	⬆️
addons/knobs/src/components/types/Number.js	8.06% <0%> (ø)	⬆️
addons/info/src/components/Props.js	37.2% <0%> (ø)	⬆️
addons/knobs/src/components/types/Boolean.js	11.62% <0%> (ø)	⬆️
lib/ui/src/libs/key_events.js	23.25% <0%> (ø)	⬆️
...codemod/src/transforms/update-organisation-name.js	40.62% <0%> (ø)	⬆️
addons/info/src/components/markdown/htags.js	30% <0%> (ø)	⬆️
... and 22 more

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