Add Email OTP section fo user 2FA section

Ash McKenzierequested to merge
570175-confidential-issue into master

What does this MR do and why?

This MR adds documentation around the email OTP two-factor option from the perspective of the UI toggle and sign in flow. There will be more MRs to come that update other areas of our documentation.

Preview

https://docs.gitlab.com/upstream-review-mr-ee-215521/user/profile/account/two_factor_authentication/#set-up-email-one-time-password-email-otp

References

https://gitlab.com/gitlab-org/gitlab/-/work_items/570175+

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Edited by Ash McKenzie

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