Description

This PR adds support for merge_group events fired by merge queues, please see the official documentation for details:

• Github Blog post
• merge_group event definition in workflow docs

I'm submitting this PR since I'm using jenkinsci/github-plugin, which is failing to accept these valid events fired by Github. It does an event-check here based on org.kohsuke.github.GHEvent (defined by this project) and, since merge_group is not a supported event, it fails with "Hook should contain event type".

Here's an example of what I see on Github Settings > Webhook on my end when Jenkins receives that payload:

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