[ORM] EntityResult doesn't handle single results

[kbond]

Consider a delete where the result is the # of deleted rows.

$result = EntityResultQueryBuilder::forEntity($this->em(), Order::class, 'o')
    ->delete()
    ->where('o.lastSyncedAt < :date')
    ->setParameter('date', new \DateTimeImmutable('-25 years'))
    ->result()
    ->asInt()
    ->first() // expect int but is null
;

The query is run successfully but because of the logic in EntityResult::first(), the exception is swallowed and the $default is returned.

Todo:

• Enable this behaviour (above example should return int)
• Throw specific exception when trying to iterate but the result isn't a collection.