Refactor update creation api

This merge request does the following:

• Raise DRF errors rather than returning response to take advantage of the DRF exception handling mechanism
• Create serialisers for PUT request to simplify the code
• Improve validation checks in several places
• Fixes several issues in DRF infrastructure uses
• Fixes JSON fields handling
• Remove routes that do no fully qualify objects
• Implement a custom DRF exception handler that will allow to log errors
• Improve testing
• Improve permission management

beat/web/experiments/serializers.py

@@ -71,7 +71,7 @@ class ExperimentCreationSerializer(serializers.ModelSerializer):
 
     def toolchain_queryset(self):
         user = self.context.get("user")
-        return annotate_full_name(Toolchain).for_user(user, True)
+        return annotate_full_name(Toolchain.objects.for_user(user, True))
 
     def validate_name(self, name):
         # sanitize_name is a static method of Versionable models but Experiment