fix: LEAP-40: Remove FF that is hard coded on feature-flag file (#4704)

* fix: LEAP-40: Remove FF that is hard coded on feature-flag file

* ci: Build frontend

Workflow run: https://github.com/HumanSignal/label-studio/actions/runs/6002291906



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Co-authored-by: robot-ci-heartex <robot-ci-heartex@users.noreply.github.com>