feat: add flow failed event

[heitorado]

related to #4120, #4119

This PR:

• Adds a new event, FlowFailedEvent
• Emits the FlowFailedEvent on an except block which will be executed if any exceptions bubble up to the kickoff flow method
• Add listener to FlowFailedEvent that will wrap up and finalise the trace batch
• Remove redundant type parameters from emit call since those are already defined in the model
• Move batch finalisation on flow finished to the FlowFinishedEvent listener so we rely on the event bus to finalise the batch rather than the kickoff method body.

towards ENG-718

[linear]

ENG-718 Improve crew/flows debugging UI by adding execution errors into traces