make `UuidMgr.getUuid(User.class, getId())` a more generic event utility for setting in (usage) events

[DaanHoogland]

@erikbocks , can we make
this._uuidMgr.getUuid(User.class, getId()); a more generic event utility? It also concerns https://github.com/apache/cloudstack/pull/11649/files though it was not changed there. I am pretty sure we can find more places. cc @vishesh92 @bernardodemarco

Originally posted by @DaanHoogland in #11824 (comment)

[erikbocks]

@DaanHoogland can you assign me to this issue?

[DaanHoogland]

@DaanHoogland can you assign me to this issue?

sure, as you wish.