Enable the `todos_bulk_actions` FF by default

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/184151



Merged-by: Lukas Eipert <leipert@gitlab.com>
Approved-by: Suzanne Selhorn <sselhorn@gitlab.com>
Approved-by: Lukas Eipert <leipert@gitlab.com>
Co-authored-by: Paul Gascou-Vaillancourt <pgascouvaillancourt@gitlab.com>
Co-authored-by: Paul Gascou-Vaillancourt <paul.gascvail@gmail.com>