DTO projection properties mapping to associations are not propulated

[mp911de]

When a DTO property is considered an association, then DtoInstantiatingConverter does not copy these properties using property population.

Typically, associations are discovered from annotations on the entity-side so it is uncommon to identify a DTO property as association unless associations derive from the target type such as AggregateReference in Spring Data JDBC.

See also spring-projects/spring-data-relational#1759.