BUG: Render invalid json when preview list

[zipofar]

Render invalid json:
preview list --output=json

{
             :id => 2316,
     :created_at => "2022-09-02T01:44:57.812Z",
     :updated_at => "2022-09-02T10:57:03.616Z",
          :state => "active",
    :preview_url => "deployment-2316-make-test-22je.app.qa-gke.uffizzi.com",
       :metadata => {
        :labels => {
            :repo => "my-repo-1"
        }
    },
    :deployed_by => {
        :email => "[email protected]"
    }
}

[moklidia]

Also need to disable comments like this when the --output option is present:

Successful Login by Identity Token
Unauthorized. Skipping credentials action.
Unauthorized. Skipping credentials action.

[the38th]

for QA:
command uffizzi preview list now has flag --output which can be json or pretty-json
uffizzi preview list --output=pretty-json should display deployments in human-readable json format
uffizzi preview list --output=json should display deployments in one-string json format

[NealArw]

TESTED - OK
CLI + Platform

[NealArw]

TESTED on production - OK