It says that Named Version is immediately available to view even if iModel checkpoint was not created yet

[aleksas-lukauskas]

1. Make sure you have a big iModel for which it would take a significant time to generate a checkpoint for a Named version.
2. Navigate Change History tab: https://qa-developer.bentley.com/my-itwins/{iTwinId}/{iModelId}/change-history/
3. Create a new Named Version > It immediately says that you can View it:
   
   However if you open it in iModel Manager page or iTwin portal page, it says that the Named Version is still being prepared because checkpoint is not generated yet:
   
   It is a concern that it should behave similarly to what is in iModel Manager page or iTwin portal page

CC: @williamkbentley a transfer from #181