Refine Matrix's Rubric and UserInput types

[Myranae]

Summary:

As part of the Server Side Scoring project, this refactors Matrix's Rubric type to contain only what is necessary for scoring. It also updates its UserInput type to reference Rubric, since both contain the same type of data. Finally, Matrix's validator tests are updated to reflect the new Rubric type.

Issue: LEMS-2469

Test plan:

• Confirm all checks pass
• Confirm Matrix still works as expected in Storybook

[github-actions]

npm Snapshot: Published

Good news!! We've packaged up the latest commit from this PR (3d881b2) and published it to npm. You
can install it using the tag PR1760.

Example:

yarn add @khanacademy/perseus@PR1760

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

./dev/tools/bump_perseus_version.sh -t PR1760

[github-actions]

Size Change: +5 B (0%)

Total Size: 867 kB

Filename	Size	Change
packages/perseus/dist/es/index.js	420 kB	+5 B (0%)

ℹ️ View Unchanged

Filename	Size
packages/kas/dist/es/index.js	38.8 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	280 kB
packages/perseus-linter/dist/es/index.js	22.2 kB
packages/perseus/dist/es/strings.js	3.4 kB
packages/pure-markdown/dist/es/index.js	3.66 kB
packages/simple-markdown/dist/es/index.js	12.4 kB

_{compressed-size-action}

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/perseus for changes to .changeset/twelve-beans-raise.md, packages/perseus/src/validation.types.ts, packages/perseus/src/widgets/matrix/matrix-validator.test.ts, packages/perseus/src/widgets/matrix/matrix-validator.ts

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