Load email otp component as 2fa fallback

Jennifer Lirequested to merge
jennli-2fa-verification-fallback-revised into master

What does this MR do and why?

Allow Email OTP to be used as a fallback option for TOTP.

Part 2 for https://gitlab.com/gitlab-org/gitlab/-/issues/570174.

References

Related: https://gitlab.com/gitlab-org/gitlab/-/issues/570174

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How to set up and validate locally

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Edited by Jennifer Li

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