feat(authenticator): add passwordless authentication support (#6783)

Author: ahmedhamouda78

.changeset/spotty-jokes-carry.md

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+---
+'@aws-amplify/ui-react-core': minor
+'@aws-amplify/ui-react': minor
+'@aws-amplify/ui': minor
+---
+
+Add passwordless authentication support

environments/auth/auth-with-passwordless/.gitignore

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+
+
+#amplify-do-not-edit-begin
+amplify/\#current-cloud-backend
+amplify/.config/local-*
+amplify/logs
+amplify/mock-data
+amplify/mock-api-resources
+amplify/backend/amplify-meta.json
+amplify/backend/.temp
+build/
+dist/
+node_modules/
+aws-exports.js
+awsconfiguration.json
+amplifyconfiguration.json
+amplifyconfiguration.dart
+amplify-build-config.json
+amplify-gradle-config.json
+amplifytools.xcconfig
+.secret-*
+**.sample
+#amplify-do-not-edit-end

environments/auth/auth-with-passwordless/.vscode/settings.json

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+{
+  "files.exclude": {
+    "amplify/.config": true,
+    "amplify/**/*-parameters.json": true,
+    "amplify/**/amplify.state": true,
+    "amplify/**/transform.conf.json": true,
+    "amplify/#current-cloud-backend": true,
+    "amplify/backend/amplify-meta.json": true,
+    "amplify/backend/awscloudformation": true
+  }
+}

environments/auth/auth-with-passwordless/README.md

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+# Auth with Passwordless
+
+This backend is configured manually via AWS Console and Amplify CLI as passwordless features are not supported by Amplify CLI/Admin UI.
+
+- Authentication
+  - `Email` login mechanism
+  - Passwordless authentication methods:
+    - Email OTP
+    - SMS OTP
+    - WebAuthn/Passkeys
+  - Password authentication (traditional)
+  - Preferred challenge: EMAIL_OTP
+
+## Configuration
+
+This environment uses a manually configured Cognito User Pool with passwordless authentication enabled.
+
+## Setup Steps
+
+This environment was created following the `auth-with-totp-mfa` example pattern:
+
+1. Created Cognito User Pool manually with USER_AUTH flow support
+2. Created Identity Pool and IAM roles
+3. Initialized Amplify project and imported Cognito resources
+4. Manually configured passwordless authentication in Cognito User Pool via AWS Console
+
+## Using this Backend
+
+Pull the existing configuration:
+
+```shell
+yarn pull
+```
+
+External contributors can re-create this backend by running:
+
+```shell
+amplify init
+```