Resolve "lists the groups to where projects can be transferred to, on `User.groups` GraphQL endpoint"

What does this MR do and why?

For #366402 (closed), originating from the discussion in #296817 (comment 1006207461).

Currently, the Project transfer locations is being coded in HAML:

But, we need to move this to a Vue component that obtains the data from a GraphQL API so that we can bring further improvements to this area (see !90127 (merged))

So, as first step, we are exposing the details of "groups accepting project transfer for the current user" via the GraphQL API.

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