Follow-up from "Add shared_runners_minutes_limit to groups and users API"

The following discussion from !1942 (merged) should be addressed:

• @grzesiek started a discussion: (+1 comment)

  Should we have a test example in user_spec.rb for this change?

We need to backport this to CE:

describe 'delegations' do
  it { is_expected.to delegate_method(:path).to(:namespace).with_prefix }
end