Provide note data for when build is triggered from note

https://github.com/jenkinsci/gitlab-plugin/blob/05806187a89b67332c4bf3db56c204052d38dac9/src/main/java/com/dabsquared/gitlabjenkins/trigger/handler/note/NoteHookTriggerHandlerImpl.java#L70-L71

The only data actually provided from the note is the content. In general I think more note data should be available, but I'm mostly interested in who commented so I can use `gitlabUserEmail` for authorization.

I'd love to submit a PR with my changes, but I don't know Java well enough to go through the proper release process. It seems like for a change like this I'd mostly have to change the mock data in tests.