Remove `realtime_labels` feature flag
What does this MR do and why?
This MR removes the realtime_labels feature flag.
Screenshots or screen recordings
No visual changes
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 #357370 (closed)
Edited by Natalia Tepluhina