Make sure that we can run OpenCOR on Ubuntu 24.04 LTS and later

[agarny]

In 23.10, Ubuntu added some restrictions which are disabled by default (see here), but from 24.04 they are enabled by default and this is causing some problems with Electron (see here and here). electron-builder is working on this issue as part of version 26.x (they added an appArmorProfile option), but it's still in pre-release, so we are waiting for an official release to address this issue.

In the meantime, we can use sudo sysctl -w kernel.apparmor_restrict_unprivileged_userns=0 to disable those restrictions.