Upload diagnostics logs to ES

• All webservice containers run a side car container that periodically uploads diagnostic data to GCS
• This container spits out logs, let's capture those
• These logs will start off as non-JSON formatted but once the container begins running the uploader script, all output is JSON formatted
• Since this is specific to rails, I figured we'd reuse the same index for rails
• Since this container does not run the gitlab-logger, we do not have a necessary filter for easy searching so we leverage the same field for subcomponent that gitlab-logger leverages to ensure this becomes easier to filter for
• Note that we lose which type our logs are for with the way that this change is set up 😬
  • If we want to fix this, we'd need to create an entry for each workload

Addresses: gitlab-org/gitlab#381447 (closed)