WS-797: Polishing QA process

Changes

Back-end

• Added new determine_state method to CapabilityRequest that will determine request state automatically, based on the state of its versions
• Capability execution state transitions now occur before the action is performed, so effectively the action is performed from the next state

UI

• "Submit" button now appears based on the state of the selected version rather than the state of the request
• The request's latest version is now selected by default in the dropdown
• Removed extraneous QA-pass button

Completes WS-798 and WS-801

shared/workspaces/test/test_states.py

@@ -100,7 +100,7 @@ class MealyMachine:
         self.signal({"event_type": "start"})
 
     def signal(self, message: Dict):
-        self.state = self.state.perform_action(message)
+        self.state = self.state.signal(message)
 
     def complete(self):
         return self.state.accepting_state()