Allow filtering of messages based on whether objects were processed

[helrond]

Is your feature request related to a problem? Please describe.

The Zodiac dashboard is currently full of task messages which indicate that nothing happened.

Describe the solution you'd like

Would be great to have some sort of flag which either hides messages which indicate nothing happened, so that users don't have to wade through tons of useless results messages.

We could then add some filter buttons to the results table which would allow users to choose what kinds of interactions they want to see.

I think there are three result types:

• Success, something actually happened
• Success, nothing was processed
• Error

Additional context

Doing this will be a lot easier now that services return consistently structured results, for example:

{ "detail": "Success!",
  "objects": [ ... ],
  "count": 3
}