This PR optimizes the new virtual fields with relationships feature
https://github.com/payloadcms/payload/pull/11805 when the path
references the ID field, for example:
```
{
name: 'postCategoryID',
type: 'number',
virtual: 'post.category.id',
},
```
Previously, we did additional population of `category`, which is
unnecessary as we can always grab the ID from the `category` value
itself. One less querying step.
fdff5871f6