At the moment, the validation that checks the boot version of the project for newer versions and support ranges operates silently (and fails silently). We should add progress support for this validation as well as showing an error message in case something fundamentally goes wrong, for example if the validation can't retrieve the information about versions from the API at spring.io. The error message should be shown as a popup.

In order to not have annoying error messages showing up all the time due to the API not being available or accessible from the users machine, in case the user has this validation set to IGNORE, the API should not be accessed at all and the error message should therefore not show up.