fix(clerk-js): Update existing `SignUp` object on `SignUpContinue` OAuth

[LauraBeatris]

Description

Resolves SDK-1689 - fixes Web3 sign-up flow with social connections.

The SDK was creating a new SignUp object on OAuth callback when continuing a signup flow, overriding properties such as web3_wallet.

Instead of creating a new SignUp object, it should update the existing one.

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: c1a59fbf3cff27263c7f3ae8c9d377d2a0a75f3e

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

This PR includes changesets to release 3 packages

Name	Type
@clerk/clerk-js	Patch
@clerk/chrome-extension	Patch
@clerk/clerk-expo	Patch

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