Sanity check for doNotFailOnForbidden fails on Dashboards startup

The sanity check for doNotFailOnForbidden was removed here: !27 (merged)

However, the removed code is still referenced in the plugin, causing the plugin crash on startup.

The solution would be to just remove the code from here: https://git.eliatra.com/eliatra-suite/eliatra-suite-dashboards-plugin/-/blob/main/server/applications/security/security.js#L39

Please also make sure that we don't use this code anywhere else - unit tests etc.