Add --format option for system status.

[jglogan]

• Closes [Request]: Align system status output with other commands. #1236.
• As with other resources, default to tabular output, with --format json alternative.
• Also changes common workflow to collect logs even when test step times out.

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation update

Motivation and Context

Least surprise - use consistent options and produce consistent output where possible.

Testing

• Tested locally
• Added/updated tests
• Added/updated docs

[saehejkang]

Is it worthwhile to add the yaml output as well for this command? I remember it was requested in #1156 and at least then container system status can be used as the pattern for other commands to follow?

[jglogan]

@saehejkang I'd like to keep this commit as small as possible.