Add "go back" possibility to cluster login quick picks

[vrubezhny]

When login in to a cluster there is no way to go back after some Quick Pick/Input Field is selected - so users are forced to completely cancel the flow and start it from scratch if made a bad choice.

[mohitsuman]

@vrubezhny This should be replaced with the new login management UI page. This is one of the reasons why we need a new UI for login workflow.

[vrubezhny]

@mohitsuman See how does it work with Back buttons added: #3359 (comment)

[rgrunber]

If the PR provided fixes the "back" button issue, then is there another reason to create a new UI (eg. #3206 ) for the time being ?