feat(elements): pre populate signup fields when navigating back to start step

[alexcarpenter]

Description

When navigating through the signup process and moving back to the start step. Populate the fields with the values provided during the signup flow.

https://github.com/clerk/javascript/assets/825855/903b5593-23df-44db-92bc-bfb4a5e283ba

https://linear.app/clerk/issue/SDK-1831/pre-populate-emailphone-number-fields-when-navigating-back-to-the

Checklist

• [ ] npm test runs as expected.
• [x] npm run build runs as expected.
• [ ] (If applicable) JSDoc comments have been added or updated for any package exports
• [ ] (If applicable) Documentation has been updated

Type of change

• [ ] 🐛 Bug fix
• [x] 🌟 New feature
• [ ] 🔨 Breaking change
• [ ] 📖 Refactoring / dependency upgrade / documentation
• [ ] other:

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 023db117233e6a4fe8dc89c926f3b4ec1557576f

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

This PR includes changesets to release 1 package

| Name | Type | | --------------- | ----- | | @clerk/elements | Patch |

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