Workaround for ATEAM-506: cherry-pick EventInfoNonConstCnvAlg from 21.0
EventInfoNonConstCnvAlg was introduced in 21.0 and was not meant to be migrated to the master. The goal of this manual cherry-pick is to provide a quick workaround to the problems discussed in ATEAM-506.
Also added some protection against the usage of EventInfoNonConstCnvAlg in AthenaMT