Add consts for all webhook actions

Timo Furrerrequested to merge
github/fork/puerco/release-events into main

Created by: puerco

This PR defines constants for all the event webhook action types sent by GitLab.

It also reuses EventActionCreate and EventActionUpdate to define the custom CommentEventType values already defined in the module.

Edited by 🤖 GitLab Bot 🤖

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