Remove deleting_account_disabled_for_users FF
What does this MR do and why?
It removes the deleting_account_disabled_for_users
feature flag.
The FF was enabled by default in %16.1 and now we can remove it.
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 #415662 (closed)