Inconsistent line breaks in LogEvent messages (V2 API)

[etanshaul]

See https://github.com/GoogleCloudPlatform/cloud-code-intellij-internal/issues/4563

To repro:

• Using the latest version of skaffold built from HEAD (latest commit at the time of opening this issue)
• Run skaffold dev with --verbosity debug on the Cloud Code java-guestbook sample
• Observe the output LogEvents from the V2 API

Debug level message - no line break

skaffoldLogEvent {
  task_id: "Build-1"
  subtask_id: "-1"
  level: INFO
  message: "Tags generated in258.279\302\265s"
}

default message - line break

skaffoldLogEvent {
  task_id: "Build-1"
  subtask_id: "java-guestbook-backend"
  level: UNKNOWN_ENUM_VALUE_LogLevel_-1
  message: "\033[32mFound Remotely\033[0m\n"
}

There is also some seemingly incorrect data in the level field.