Expose pipeline_id in the job_info part of CI Job payload

What does this MR do and why?

Expose pipeline_id in the job_info part of CI Job payload

While GitLab Runner doesn't need any CI Pipeline context for job execution -- on the Runner side every job is executed individually and without connection to any other job -- information about Pipeline ID may be useful for some analytics and logging. For example - we want to include information about job's pipeline within the billing event context.

This commit exposes the ID in the payload, making it possible for GitLab Runner to consume it.

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