After double click or choosing Refresh in context menu of a v3 connection there is shown tree item Loading right under the connect

If connection does not contain any project, the item is removed and only connection item is shown again. But in mean time (during the loading), the item is shown. It acts, at least for me, not pretty (a bit distracting, if I am running OpenShift locally, it pretty fast expand and collapse, really not nice). We should just show running loading resources job and right after job is done, the items under the specific connection should be updated (if there is any project, show it, if there is nothing, do not show anything). For v2 connection we do not show any similar tree item, we just load domain(s) if there is any.