JSON formatter for CLI tools preserves ASCII escape sequences

[lukebakken]

Describe the bug

ASCII escape codes can be seen in JSON formatter output when CLI tools are used.

Reproduction steps

• Start cluster
• Put node into maintenance mode
• Look at the cluster status using the JSON formatter:

  lbakken@shostakovich ~/development/rabbitmq/rabbitmq-server (main $%=)
  $ ./sbin/rabbitmqctl -n rabbit-1 --formatter=json cluster_status|jq .maintenance_status
  {
    "rabbit-1@shostakovich": "넀[35mmarked for maintenance넀[0m",
    "rabbit-2@shostakovich": "not under maintenance",
    "rabbit-3@shostakovich": "not under maintenance"
  }
  

Expected behavior

No ASCII escape codes in the JSON output

Additional context

No response