Add parsed errors to default OutputError message

[msx2]

Update default Opera::Operation::Result::OutputError message to include parsed errors as part of the message.

In ProFinda's current stack it's not always easy to see and find specific exceptions, returned as just Cannot retrieve output from a Failure.. DataDog properly logs error params, but we're still lacking visibility in Rollbar, Sidekiq UI and development/test modes.

Change previously discussed with @cintrzyk to improve our error handling workflow.

New examples of the errors output:

Operation failed — output cannot be retrieved.
- example: Example error

Operation failed — output cannot be retrieved.
- example: Example error; Unexpected behavior
- other_example: Hello darkness, my old friend