Add end-to-end test for login with 2FA

What does this MR do?

Adds end-to-end test for login with 2FA.

This Test is currently skipped in staging with :skip_live_env due to the reasons mentioned in this issue: https://gitlab.com/gitlab-org/quality/team-tasks/-/issues/562

Closes gitlab-org/quality/testcases#805 (closed)

Conformity

• [-] Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Security

If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:

• [-] Label as security and @ mention @gitlab-com/gl-security/appsec
• [-] The MR includes necessary changes to maintain consistency between UI, API, email, or other methods
• [-] Security reports checked/validated by a reviewer from the AppSec team