Reverting portal disable functionality, causing clipping behavior.

[catandthemachines]

Summary:

Adding back portal functionality for Expression Widget to ensure it does not get clipped.

This implementation was originally added in this PR: #1424

Issue: LEMS-2224

Test plan:

Go to https://khan.github.io/perseus/?path=/story/perseus-widgets-expression--desktop-kitchen-sink
Confirm that you have to tab through all the tab pannels to get the the main keypad, instead of going directly to the keypad.

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/young-clocks-walk.md, packages/perseus/src/components/math-input.tsx, packages/math-input/src/components/keypad/keypad-mathquill.stories.tsx, packages/math-input/src/components/tabbar/item.tsx, packages/perseus/src/components/__tests__/math-input.test.tsx, packages/math-input/src/components/keypad/__tests__/__snapshots__/keypad.test.tsx.snap

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[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (b8c887c) and published it to npm. You
can install it using the tag PR1461.

Example:

yarn add @khanacademy/perseus@PR1461

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

./dev/tools/bump_perseus_version.sh -t PR1461

[github-actions]

Size Change: +180 B (+0.02%)

Total Size: 849 kB

Filename	Size	Change
packages/math-input/dist/es/index.js	80.8 kB	+190 B (+0.24%)
packages/perseus/dist/es/index.js	411 kB	-10 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.3 kB
packages/kmath/dist/es/index.js	4.27 kB
packages/math-input/dist/es/strings.js	1.73 kB
packages/perseus-core/dist/es/index.js	1.48 kB
packages/perseus-editor/dist/es/index.js	270 kB
packages/perseus-linter/dist/es/index.js	21.6 kB
packages/perseus/dist/es/strings.js	3.21 kB
packages/pure-markdown/dist/es/index.js	3.67 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[handeyeco]

Thanks Cat!

[handeyeco]

This is part of the revert?

[catandthemachines]

Yes, I removed it because without the portal it was no longer necessary. Now that we're doing portaling again we need the timeout behavior.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.31%. Comparing base (b9087f7) to head (b8c887c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1461      +/-   ##
==========================================
+ Coverage   69.66%   70.31%   +0.64%     
==========================================
  Files         506      509       +3     
  Lines      104885   104938      +53     
  Branches     7561    11371    +3810     
==========================================
+ Hits        73071    73784     +713     
+ Misses      31626    31154     -472     
+ Partials      188        0     -188     

Files	Coverage Δ
packages/math-input/src/components/tabbar/item.tsx	100.00% <100.00%> (+0.64%)	⬆️
packages/perseus/src/components/math-input.tsx	81.78% <ø> (+1.10%)	⬆️

... and 144 files with indirect coverage changes

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