Add work items realtime feature flag definitions
What does this MR do and why?
Adds 2 new feature flag definitions to support the development of realtime data on planning views.
work_item_realtime_broadcastto gate backend emission of eventswork_item_realtimeto gate frontend subscribing to namespaces on the backend
Note that this MR contains only the feature flag definitions, with additional MRs to include the realtime changes themselves
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