feat(authenticator): add react support for email mfa

[jjarvisp]

Description of changes

The purpose of this pull request is to expand authenticator support for email mfa.

The react authenticator now renders two new screens in response to the two new states added to the state machine in #6317. This update allows completion of email MFA based sign ins, email MFA setup, and the selection challenges that allow users to choose which MFA method to setup or sign in with.

1. selectMfaType -> SelectMfaType : CONTINUE_SIGN_IN_WITH_MFA_SETUP and CONTINUE_SIGN_IN_WITH_MFA_SELECTION
2. setupEmail -> SetupEmail : CONTINUE_SIGN_IN_WITH_EMAIL_SETUP

Issue #, if available

Description of how you validated changes

• manual testing
• e2e testing

Checklist

• Have read the Pull Request Guidelines
• PR description included
• yarn test passes and tests are updated/added
• PR title and commit messages follow conventional commit syntax
• If this change should result in a version bump, changeset added (This can be done after creating the PR.) This does not apply to changes made to docs, e2e, examples, or other private packages.

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

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