Add payload for Tracking failed Service Pings for self-managed instances

What does this MR do and why?

This MR adds some basic metadata to Serivice Ping payload.

This is the first iteration, adds the following:

{
  meta: {
    generation: { 
      status: string,
      duration: number
    }
  }
}

How to set up and validate locally

• Set up a license for the development, we can ask for a license using an AR I have a license with customer service enabled.
• start rails console GITLAB_LICENSE_MODE=test rails c
• Generate a service ping ServicePing::SubmitService.new.execute
• Check the meta field. RawUsageData.last.payload['meta']

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.

Related to #345389 (closed)