Other errata type was added in https://github.com/Katello/katello/pull/11188, but it does not support scoped search when searching for errata. On the Content -> Content Types -> Errata page, `"type = other"` should return all errata package types that are not of type 'bugfix', 'enhancement', or 'security'.

Redmine: https://projects.theforeman.org/issues/38135