Remove two_line_mention_enabled feature flag
What does this MR do and why?
Based on feedback (#385261 (comment 1226150785)) a new To-Do design for mentions was implemented behind a feature flag to first test with realistic data. This MR now removes that feature flag and makes the new design available for everyone.
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.
Edited by Marcel van Remmerden