[BUG] Actor state store error on `try_add_state`

[elena-kolevska]

Expected Behavior

The actor try_add_state should save a newly added key to the store.

Actual Behavior

The actor try_add_state method returns the error The actor state name {state_name} already exist. for keys that don't exist.

Steps to Reproduce the Problem

Try to call the try_add_state method on an actor with a key that doesn't exist.

Release Note

RELEASE NOTE: FIX Fixed not being able to save new keys with try_add_state