We cannot add the notification insert id directly
to the following contactnotifications queries. Instead
we need to pass a DbValue reference which gets set after
the notification insert id is calculated.
The contactnotifications insert queries are fired as query
group calling CanExecuteQuery() and FieldToEscapedString().
If the notification id does not exist yet, the queries are
moved to the end of the queue.
Once the contactnotifications queries are fired the DbValue
reference is destroyed.
This patch also removes the old notification insert id cache
which was broken in many ways.
fixes#11387
