Add break down of dedicated designer per Release group
This MR is a proposal to reflect the current break down of UX responsibilities within the Release stage group.
The nomination is based on https://about.gitlab.com/handbook/product/categories/#release-stage
The main consideration being made is that we want to keep having an overview of UX for Release as a whole, therefore Mike and I work under both subgroups (Progressive Delivery, and Release Management).
Having a clear break down of who is the UX dri of which functionalities will help with workload, assigning of issues/questions, and provide the eng/pm team with a a main point of contact for UX.