fix(elements): Correct TS types for verification machine

[LekoArts]

Description

Inside our verification machine we had a bunch of as unknown as SignInFactor assertions and other inaccurate TS types. This PR fixes it 👍 See inline comments for more context.

Fixes SDK-1845

Checklist

• [x] 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

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: e0e2dff978c044ca8e55b744a18a16f87bdac49a

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

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