Delete Storybook stories that use randomly generated data

[benchristel]

These aren't particularly useful - the widgets they generate often look broken,
and it's hard to tell if there's a bug in the widget or the input data is just
something a human would never create.

I believe this completes the effort (started by @handeyeco) to move code out of
perseus/src/widgets and into specific widget subdirectories.

Issue: none

Test plan:

yarn test

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/proud-goats-provide.md, packages/perseus/src/widgets/categorizer/categorizer.testdata.ts, packages/perseus/src/widgets/dropdown/dropdown.testdata.ts, packages/perseus/src/widgets/explanation/explanation.testdata.ts, packages/perseus/src/widgets/expression/expression.testdata.ts, packages/perseus/src/widgets/radio/__tests__/radio.testdata.ts

---

Don't want to be involved in this pull request? Comment #removeme and we won't notify you of further changes.

[github-actions]

Size Change: 0 B

Total Size: 858 kB

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.3 kB
packages/keypad-context/dist/es/index.js	760 B
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/index.js	78 kB
packages/math-input/dist/es/strings.js	1.79 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	275 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/index.js	417 kB
packages/perseus/dist/es/strings.js	3.36 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.47%. Comparing base (d88b0ff) to head (6f1df1a).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1594      +/-   ##
==========================================
- Coverage   70.54%   70.47%   -0.07%     
==========================================
  Files         547      571      +24     
  Lines      106936   111383    +4447     
  Branches     5550    11221    +5671     
==========================================
+ Hits        75433    78497    +3064     
- Misses      31387    32886    +1499     
+ Partials      116        0     -116     

see 1117 files with indirect coverage changes

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[handeyeco]

Conceptually I like the idea, but I think we need something like "random exercise from prod data" or something (outside of the scope of this PR).

Thanks for taking the initiative on this.

EDIT: also I commented on the check issues in the other PR. Likely to do with how your IDE is auto-changing imports and the solutions is probably changing back to relative imports.

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (6f1df1a) and published it to npm. You
can install it using the tag PR1594.

Example:

yarn add @khanacademy/perseus@PR1594

If you are working in Khan Academy's webapp, you can run:

./dev/tools/bump_perseus_version.sh -t PR1594