feat(auth): add passwordless authentication options to client config

[ahmedhamouda78]

Problem

Add passwordless authentication configuration to the generated amplify_outputs.json file to enable frontend libraries to configure passwordless authentication flows (Email OTP, SMS OTP, and WebAuthn) and specify the preferred authentication challenge.

Issue number, if available:

Related to #3053

Changes

This PR adds passwordless configuration and preferred challenge to the client config output:

• Added passwordlessOptions field to auth output schema v1
• Added preferredChallenge prop to AuthProps (accepts 'EMAIL_OTP' | 'SMS_OTP' | 'PASSWORD' | 'WEB_AUTHN', defaults to 'EMAIL_OTP')
• Outputs emailOtpEnabled, smsOtpEnabled, webAuthn configuration, and preferredChallenge

Corresponding docs PR, if applicable:

N/A

Validation

• Added unit test

Checklist

• If this PR includes a functional change to the runtime behavior of the code, I have added or updated automated test coverage for this change.
• If this PR requires a change to the Project Architecture README, I have included that update in this PR.
• If this PR requires a docs update, I have linked to that docs PR above.
• If this PR modifies E2E tests, makes changes to resource provisioning, or makes SDK calls, I have run the PR checks with the run-e2e label set.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[changeset-bot]

🦋 Changeset detected

Latest commit: 4777f5d

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

This PR includes changesets to release 3 packages

Name	Type
@aws-amplify/backend-output-schemas	Minor
@aws-amplify/auth-construct	Minor
@aws-amplify/client-config	Minor

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