[UX] Improve the plan format

[peterschmidt85]

1. Run configuration type:

• [ ] Consider showing some minor properties only if --verbose is set, e.g. project, user
• [ ] Consider not showing configuration properties if they're not set (and there is no default value), e.g. max_price, retry, max_duration, inactivity_duration, etc.
• [ ] Consider including all major configuration properties if they are set, e.g. nodes, fleets, regions, etc.
• [ ] Consider using space more efficiently, e.g. via multi-column layout?
• [ ] For resources, currently the default resources are shown as cpu=2.. mem=8GB.. disk=100GB.. - it doesn't mention the important default for gpu. The correct plan should be cpu=2.. mem=8GB.. disk=100GB.. gpu: 1..
• [ ] (Optional) Consider using exact property names, e.g. inactivity_duration instead of Inactivity duration

2. Other configuration types:

Potentially, this also applies to other types of configurations but that can be done via another issue.