Return identity_feature_state in the /projects/{project_id}/features?identity=id endpoint #7095
Description
Is your feature request related to a problem?
The frontend chains a lot of endpoints together in order to display identity overrides which is especially problematic where we have pages of feaures.
Describe the solution you'd like.
/projects/26448/features?environment=id returns environment_feature_state, we should have for /projects/26448/features?identity=id return identity_feature_state
Describe alternatives you've considered
Keep lots of dead code
Additional context
This will help remove a lot of old redux / javascript code