test: ErrorBoundary dedicated directory and tests

[geido]

SUMMARY

This PR adds the tests for the ErrorBoundary component while moving it to its own dedicated directory.

[junlincc]

Thank you @geido for adding test to this component, which previously have no test coverage at all. 🙏 🙂

[nytai]

lgtm, just minor nit. Let me know if you want to address or if I should merge as is.

[codecov]

Codecov Report

Merging #13276 (5efc2f1) into master (9b5e66b) will increase coverage by 0.68%.
The diff coverage is 62.13%.

@@            Coverage Diff             @@
##           master   #13276      +/-   ##
==========================================
+ Coverage   72.29%   72.98%   +0.68%     
==========================================
  Files         864      598     -266     
  Lines       44883    21266   -23617     
  Branches     5403     5498      +95     
==========================================
- Hits        32450    15521   -16929     
+ Misses      12224     5618    -6606     
+ Partials      209      127      -82     

Flag	Coverage Δ
cypress	57.65% <33.94%> (?)
javascript	62.79% <59.02%> (+0.54%)	⬆️
python	?

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
superset-frontend/src/chart/Chart.jsx	64.15% <0.00%> (+20.29%)	⬆️
...rc/common/components/Collapse/Collapse.stories.tsx	0.00% <0.00%> (ø)
...-frontend/src/common/components/Collapse/index.tsx	100.00% <ø> (ø)
...set-frontend/src/common/components/Modal/Modal.tsx	100.00% <ø> (ø)
...-frontend/src/common/components/common.stories.tsx	0.00% <ø> (ø)
superset-frontend/src/common/components/index.tsx	100.00% <ø> (ø)
...mponents/AsyncAceEditor/AsyncAceEditor.stories.tsx	0.00% <0.00%> (ø)
...t-frontend/src/components/AsyncAceEditor/index.tsx	87.75% <ø> (ø)
...rset-frontend/src/components/AsyncSelect/index.jsx	96.29% <ø> (ø)
...rset-frontend/src/components/DeleteModal/index.tsx	100.00% <ø> (ø)
... and 627 more

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