fix(Modal|Portal): fix an error with unsafe setState()

[layershifter]

Fixes #4200.

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This PR fixes a reported issue in #4200. It happens when a component gets unmounted before .setState() call.
Test that covers this scenario is also added.

[github-actions]

size-limit report

Path	Size
bundle-size/dist/Button.size.js	58.73 KB (0%)
bundle-size/dist/Icon.size.js	25.21 KB (0%)
bundle-size/dist/Image.size.js	53.91 KB (0%)
bundle-size/dist/Modal.size.js	68.87 KB (0%)
bundle-size/dist/Portal.size.js	40.61 KB (0%)

[codecov-commenter]

Codecov Report

Merging #4259 (f5e56e4) into master (ad83d82) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #4259   +/-   ##
=======================================
  Coverage   99.75%   99.75%           
=======================================
  Files         180      180           
  Lines        3241     3241           
=======================================
  Hits         3233     3233           
  Misses          8        8           

Impacted Files	Coverage Δ
src/addons/Portal/Portal.js	100.00% <100.00%> (ø)
src/modules/Modal/Modal.js	100.00% <100.00%> (ø)

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[laukaichung]

Thank you for the fix. When would you expect it to be released?

[layershifter]

@laukaichung it was released yesterday 🎉