add "outgoing events" to the provider tile graph

[shahargl]

[shahargl]

Thinking about a simple solution, I got into:

1. Parse workflowexecutionresult to get providers - currently it has only the step name and not the provider (we can parse it from workflow_raw but its overkill)
2. Adding some hook to _notify in some new table (?) - seems overkill also

Leaving it for now :(