feat(elements): Infer base path

[LekoArts]

Description

The path prop on the <SignIn.Root> and <SignUp.Root> component is now automatically inferred. Previously, the default values were /sign-in and /sign-up, on other routes you had to explicitly define your route.

The new heuristic for determining the path where <SignIn.Root> and <SignUp.Root> are mounted is:

1. path prop
2. Automatically inferred
3. If it can't be inferred, fallback to CLERK_SIGN_IN_URL and CLERK_SIGN_UP_URL env var
4. Fallback to /sign-in and /sign-up

Fixes SDK-1791

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

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

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: 3567e146ab487d808db22750a7ee170ed42f15a0

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 | Minor |

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