Remove the `ensure_verified_primary_email_for_2fa` feature flag
What does this MR do and why?
This MR removes the ensure_verified_primary_email_for_2fa feature flag.
The flag was deployed enabled by default in %14.3.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #340151 (closed)