Added test case for HHH-14125 'Selecting EntityCollection fails

[cptwunderlich]

Added test case for HHH-14125 'Selecting EntityCollection fails ("not an entity")'

select e.someStrings from EntityWithAnElementCollection e

fails with the Exception "not an entity". Fetching any property of basic type or entity association works. With ElementCollection, only works with explicit join.

I looked at org.hibernate.hql.internal.ast.tree.SelectClause#initializeExplicitSelectClause - selectExpression.isScalar()is false because CollectionType.isAssociation() returns true. I've tried to change that, but this doesn't work and is clearly not the whole story. Unfortunately, I'm new to the code base and couldn't quite figure it out.

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