feat(elements): Add `complete` step to Sign Up and Sign In.

[tmilewski]

Description

Add a complete step to Sign In and Sign Up flows for when a user is being set as active and has yet to be redirected to the desired URL.

<SignIn.Step name="complete">
  Welcome back! You're being redirected...
</SignIn.Step>

<SignUp.Step name="complete">
  Welcome! You're being redirected...
</SignUp.Step>

Fixes SDK-1712

Checklist

• [ ] npm test runs as expected.
• [ ] 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: 197815013e043256b519d0366ac3d244be985a39

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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