test(partition): mosaic plot story knob for alternatives selector

[monfera]

Summary

Mosaic storybook example here
Read the motivation for mosaic plot in the PR #1113

Checklist

Delete any items that are not applicable to this PR.

• This was checked for cross-browser compatibility
• Proper documentation or storybook story was added for features that require explanation or tutorials

[codecov-io]

Codecov Report

Merging #1120 (860d81e) into master (2ee1b91) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1120   +/-   ##
=======================================
  Coverage   72.25%   72.25%           
=======================================
  Files         387      387           
  Lines       12019    12019           
  Branches     2629     2629           
=======================================
  Hits         8684     8684           
  Misses       3310     3310           
  Partials       25       25           

Flag	Coverage Δ
unittests	72.25% <ø> (ø)

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[nickofthyme]

🎉 This PR is included in version 28.2.0 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)

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