Draft: Spike seat assignments GraphQL API

What does this MR do and why?

Spike seat assignments GraphQL API

Create a rough draft of the GraphQL API for seat assignments

Issue: https://gitlab.com/gitlab-org/gitlab/-/issues/563130+

References

Sample query:

{
  group(fullPath:"solar-system-group") {
    id
    name
    seatAssignments {
      count
      nodes {
        seatType
        user {
          name
          username
          avatarUrl
        }
      }
    }
  }

  seatAssignments(userId:"gid://gitlab/User/60") {
    count
    nodes {
      seatType
      user {
        name
      }
      namespace {
        name
      }
    }
  }
}

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Before	After

How to set up and validate locally

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