Standardize output format options for lists

[craicoverflow]

There is a mix of formats used for "table" type.

The list topics commands uses -o plain-text for printing to a table
Everything else uses -o table

From https://clig.dev/#output:

If human-readable output breaks machine-readable output, use --plain to display output in plain, tabular text format for integration with tools like grep or awk

We should use plain as it is normal practice. kubectl does not have a value for "table". The only options are "json|yaml|wide|custom-columns".