Provide ability to configure the amount of output reported

[bryantbiggs]

Use case

Users may be interested in different levels of output. For example, some users may want to see only the required checks that failed and ignore the recommended checks. Others may want to see all reported results, even if there are no required/recommended changes.

Solution/User Experience

Configure output levels

    --quiet - suppress all output
    (default, no flags) - show failed checks on hard requirements
    --warn - in addition to failed, show warnings (low number of IPs available for nodes/pods, addon version older than current default, etc.)
    --info - in addition to failed and warnings, show informational notices (number of IPs available for nodes/pods, addon version relative to current default and latest, etc.)

Alternative solutions

No response