Resolve #1155: Different signature of startup/shutdown events on polling and webhooks (#1156)

* Code refactor
- Use 'or' istead of 'A if A else B'
- Raise new error from catched error: raise Error from e

* Fixed signature of startup/shutdown events
- Include the **dispatcher.workflow_data as the handler arguments

CHANGES/1155.bugfix.rst

@@ -0,0 +1 @@
+Fixed signature of startup/shutdown events to include the **dispatcher.workflow_data as the handler arguments.