perf: optimize virtual fields that reference ID

[r1tsuu]

This PR optimizes the new virtual fields with relationships feature #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.

[github-actions]

🚀 This is included in version v3.36.0