Updating the delivery-metrics README about job event webhooks
What does this MR do and why?
For issue gitlab-com/gl-infra/delivery#2616 (closed)
Changes to the delivery-metrics job event webhooks were made as part of epic gitlab-com/gl-infra&757 (closed) so this is to update the README to make it up to date.
Author Check-list
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Has documentation been updated?