WB-1804 Use h2 in ModalHeader

[Chalayyy]

Summary:

Per this conversation, we want to update the headers in modals to use h2 instead of the default h3 that comes with HeadingMediums

Issue: WB-1804, AX-340

Test plan:

• Run unit and snapshot tests with yarn test and yarn jest -u
• Verify in Storybook that OnePaneDialog and ModalHeader have h2 titles instead of h3
  

[changeset-bot]

🦋 Changeset detected

Latest commit: 9b926c2

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

This PR includes changesets to release 5 packages

Name	Type
@khanacademy/wonder-blocks-modal	Patch
@khanacademy/wonder-blocks-dropdown	Patch
@khanacademy/wonder-blocks-popover	Patch
@khanacademy/wonder-blocks-tooltip	Patch
@khanacademy/wonder-blocks-birthday-picker	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[khan-actions-bot]

Gerald

Required Reviewers

• @Khan/wonder-blocks for changes to .changeset/gentle-moons-prove.md, .changeset/wet-walls-roll.md, packages/wonder-blocks-modal/src/components/modal-header.tsx

---

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[github-actions]

npm Snapshot: Published

🎉 Good news!! We've packaged up the latest commit from this PR (ef67538) and published all packages with changesets to npm.

You can install the packages in webapp by running:

./services/static/dev/tools/deploy_wonder_blocks.js --tag="PR2369"

Packages can also be installed manually by running:

yarn add @khanacademy/wonder-blocks-<package-name>@PR2369

[github-actions]

Size Change: +8 B (+0.01%)

Total Size: 101 kB

Filename	Size	Change
packages/wonder-blocks-modal/dist/es/index.js	5.37 kB	+8 B (+0.15%)

ℹ️ View Unchanged

Filename	Size
packages/wonder-blocks-accordion/dist/es/index.js	3.78 kB
packages/wonder-blocks-banner/dist/es/index.js	1.53 kB
packages/wonder-blocks-birthday-picker/dist/es/index.js	1.77 kB
packages/wonder-blocks-breadcrumbs/dist/es/index.js	887 B
packages/wonder-blocks-button/dist/es/index.js	4.04 kB
packages/wonder-blocks-cell/dist/es/index.js	2.01 kB
packages/wonder-blocks-clickable/dist/es/index.js	3.06 kB
packages/wonder-blocks-core/dist/es/index.js	3.44 kB
packages/wonder-blocks-data/dist/es/index.js	6.24 kB
packages/wonder-blocks-dropdown/dist/es/index.js	18.4 kB
packages/wonder-blocks-form/dist/es/index.js	6.28 kB
packages/wonder-blocks-grid/dist/es/index.js	1.36 kB
packages/wonder-blocks-i18n/dist/es/index.js	4.76 kB
packages/wonder-blocks-icon-button/dist/es/index.js	3 kB
packages/wonder-blocks-icon/dist/es/index.js	871 B
packages/wonder-blocks-labeled-field/dist/es/index.js	72 B
packages/wonder-blocks-layout/dist/es/index.js	1.82 kB
packages/wonder-blocks-link/dist/es/index.js	2.28 kB
packages/wonder-blocks-pill/dist/es/index.js	1.65 kB
packages/wonder-blocks-popover/dist/es/index.js	4.87 kB
packages/wonder-blocks-progress-spinner/dist/es/index.js	1.52 kB
packages/wonder-blocks-search-field/dist/es/index.js	1.3 kB
packages/wonder-blocks-switch/dist/es/index.js	1.94 kB
packages/wonder-blocks-testing-core/dist/es/index.js	3.74 kB
packages/wonder-blocks-testing/dist/es/index.js	1.07 kB
packages/wonder-blocks-theming/dist/es/index.js	693 B
packages/wonder-blocks-timing/dist/es/index.js	1.8 kB
packages/wonder-blocks-tokens/dist/es/index.js	2.36 kB
packages/wonder-blocks-toolbar/dist/es/index.js	905 B
packages/wonder-blocks-tooltip/dist/es/index.js	7.08 kB
packages/wonder-blocks-typography/dist/es/index.js	1.23 kB

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[github-actions]

A new build was pushed to Chromatic! 🚀

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Chromatic results:

Metric	Total
Captured snapshots	undefined
Tests with visual changes	undefined
Total stories	undefined
Inherited (not captured) snapshots [TurboSnap]	undefined
Tests on the build	undefined