[hooks] Skip modification_date attribute in "notifentityupdated" hook
Depending on the call order of hooks, "modification_date" may come in
entity.cw_edited or not (from "metaattrsupdate" hook usually). It should
however not be considered in the notification context.
Closes #8842064.
addressbook
basket
blog
book
calendar
comment
company
email
file
folder
i18ncontent
keyword
link
mailinglist
person
tag
timeseries
vcsfile