Keep password in memory until session closes, or for a set duration

[jenswegar]

A usability issue for me is that I constantly have to paste my Jenkins password when validating the file, since I don't want to save the password with the workspace. So an improvement in my opinion would be if the extension could prompt for the password once, and then store the password for the duration that the workspace is open. Or alternatively store it for a fixed duration, e.g. 10 minutes before asking again. Would make it faster to work with since I don't have to copy/paste from my password manager all the time :)