Add pipeline name in the webhook pipeline event payload

Problem to solve

We are trying to collect the job and pipeline data using the webhook pipeline_event and job_event. Under job_event we have build_name but pipeline event has only the id and the corresponding pipeline_name or the bridge name is missing forcing us to make an API call to derive that information. Even the API does not have the pipeline_name but it has the bridge name if we dig more deep from the default top layer response from the API. This is the documentation I have been refering to understand what data is available in the event. I even has a Gitlab Support ticket to get help and I was asked to create this feature request.

Our proposal is to include the pipeline_name or bridge_name.