Revert "Roll v2 Keypad Onto Desktop Web (#645)" to unblock release while making focus changes

[nedredmond]

This reverts commit e036092.

On August 17, a few conversations were had that led to the following plan of attack for Keypad focus handling:
https://khanacademy.slack.com/archives/C8XGW76FQ/p1692301859002839?thread_ts=1692120760.613379&cid=C8XGW76FQ

While we make the necessary changes to Keypad and then to the expression widget, reverting this to keep Perseus releasable.

[changeset-bot]

🦋 Changeset detected

Latest commit: 8a52f64

The changes in this PR will be included in the next version bump.

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[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/five-meals-wink.md, packages/perseus/src/components/math-input.tsx, packages/perseus/src/styles/perseus-renderer.less, packages/perseus/src/widgets/expression.tsx, packages/perseus-editor/src/widgets/expression-editor.tsx, packages/perseus-editor/src/widgets/interaction-editor.tsx, packages/perseus/src/components/__stories__/math-input.stories.tsx, packages/perseus/src/components/__tests__/math-input.test.tsx, packages/perseus/src/styles/widgets/expression.less, packages/perseus/src/widgets/__tests__/expression.test.ts, packages/perseus-editor/src/widgets/interaction/constraint-editor.tsx

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[github-actions]

Size Change: -2.06 kB (0%)

Total Size: 846 kB

Filename	Size	Change
packages/perseus-editor/dist/es/index.js	268 kB	+23 B (0%)
packages/perseus/dist/es/index.js	396 kB	-2.08 kB (-1%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38 kB
packages/kmath/dist/es/index.js	4.13 kB
packages/math-input/dist/es/index.js	102 kB
packages/perseus-core/dist/es/index.js	55 B
packages/perseus-error/dist/es/index.js	705 B
packages/perseus-linter/dist/es/index.js	21.2 kB
packages/pure-markdown/dist/es/index.js	3.65 kB
packages/simple-markdown/dist/es/index.js	12.6 kB

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[github-actions]

npm Snapshot: Published

🎉 Good news!! We've packaged up the latest commit from this PR (e25e659) and published it to npm. You
can install it using the tag PR675.

Example:

yarn add @khanacademy/perseus@PR675

[coveralls]

coverage: 69.352% (+0.03%) from 69.327% when pulling 8a52f64 on ned/revert-for-focus-refactor into b93f9f7 on main.