feat: implemented force speech functionality in RI and refactored actuation_receiver tests

Before actuation_receiver tests started a receiver with real zmq context. This led to flaky tests because of port congestion issues.

ref: N25B-386

src/robot_interface/state.py

@@ -30,6 +30,7 @@ class State(object):
         self.exit_event = None
         self.sockets = []  
         self.qi_session = None 
+        self.is_speaking = False
 
     def initialize(self):
         """