Properties discovered by HasKey or similar are not discovered as primitive collections

For example, assuming `CollectionCompanyId` and `CollectionTenantId are not discovered as properties by convention (for example, they are fields), then:

```C#
modelBuilder.Entity(
b =>
{
b.HasKey(e => new { e.CollectionCompanyId, e.CollectionTenantId });
});
```

Will add the properties to the model, but as non-collection primitive properties. The workaround is to explicit map the primitive collections first:

```C#
modelBuilder.Entity(
b =>
{
b.PrimitiveCollection(e => e.CollectionCompanyId);
b.PrimitiveCollection(e => e.CollectionTenantId);
b.HasKey(e => new { e.CollectionCompanyId, e.CollectionTenantId });
});
```