Add work items realtime feature flag definitions

Matt D'Angelorequested to merge
work-item-realtime-feature-flags into master

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_broadcast to gate backend emission of events
  • work_item_realtime to 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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