Vectronics server status

[Huh]

Today @HansMartinMT tried the fetch_vectronics workflow and got and error, which resolved itself a short while later. This is potentially due to the vectronics server being down or otherwise unresponsive. Given that we have a call to httr::warn_for_status we should show the user anything that is not a 200. This is to update.

See this link for further explanation and implementation
https://httr.r-lib.org/reference/stop_for_status.html