Add pipeline name to job webhook events

Summary

We plan to receive job webhook events from all projects that a deployment pipeline creates downstream pipelines in. Most projects also run pipelines for other reasons/purposes. When a job webhook event is received by Delivery-metrics, it needs to filter out the events that are not from pipelines triggered by a deployment pipeline. Pipeline names can help Delivery-metrics identify which pipeline the webhook event comes from.

Proposal

workflow:name documentation: https://docs.gitlab.com/ee/ci/yaml/index.html#workflowname.

Edited by Reuben Pereira