[polaris-migrator] Add migration to support dirty prop on Modal

[laurkim]

WHY are these changes introduced?

Resolves 1058.

WHAT is this pull request doing?

Adds new migration to support dirty on Modal. This is a temp migration and will not be committed to main.

How to 🎩

🖥 Local development instructions 🗒 General tophatting guidelines 📄 Changelog guidelines

🎩 checklist

• [ ] Tested a snapshot
• [ ] Tested on mobile
• [ ] Tested on multiple browsers
• [ ] Tested for accessibility
• [ ] Updated the component's README.md with documentation changes
• [ ] Tophatted documentation changes in the style guide

[laurkim]

/snapit

[github-actions[bot]]

🫰✨ Thanks @laurkim! Your snapshot has been published to npm.

Test the snapshot by updating your package.json with the newly published version:

"@shopify/polaris-migrator": "0.0.0-snapshot-20240924174049"

[laurkim]

/snapit

[github-actions[bot]]

🫰✨ Thanks @laurkim! Your snapshot has been published to npm.

Test the snapshot by updating your package.json with the newly published version:

"@shopify/polaris-migrator": "0.0.0-snapshot-20240924175223"

[laurkim]

/snapit

[github-actions[bot]]

🫰✨ Thanks @laurkim! Your snapshot has been published to npm.

Test the snapshot by updating your package.json with the newly published version:

"@shopify/polaris-migrator": "0.0.0-snapshot-20240924190830"

[laurkim]

/snapit

[github-actions[bot]]

🫰✨ Thanks @laurkim! Your snapshot has been published to npm.

Test the snapshot by updating your package.json with the newly published version:

"@shopify/polaris-migrator": "0.0.0-snapshot-20240924194602"

[laurkim]

/snapit

[github-actions[bot]]

🫰✨ Thanks @laurkim! Your snapshot has been published to npm.

Test the snapshot by updating your package.json with the newly published version:

"@shopify/polaris-migrator": "0.0.0-snapshot-20240924195252"