fix: respect hidden: true for virtual fields that have reference to a relationship field (#12219)

Previously, `hidden: true` on a virtual field that references a
relationship field didn't work. Now, this field doesn't get calculated
if there's `hidden: true` and no `showHiddenFields` was passed.

Co-authored-by: Dan Ribbens <dan.ribbens@gmail.com>

test/database/int.spec.ts

@@ -2014,6 +2014,26 @@ describe('database', () => {
       expect(doc.postTitle).toBe('my-title-10')
     })
 
+    it('should respect hidden: true for virtual fields with reference', async () => {
+      const post = await payload.create({ collection: 'posts', data: { title: 'my-title-3' } })
+      const { id } = await payload.create({
+        collection: 'virtual-relations',
+        depth: 0,
+        data: { post: post.id },
+      })
+
+      const doc = await payload.findByID({ collection: 'virtual-relations', depth: 0, id })
+      expect(doc.postTitleHidden).toBeUndefined()
+
+      const doc_show = await payload.findByID({
+        collection: 'virtual-relations',
+        depth: 0,
+        id,
+        showHiddenFields: true,
+      })
+      expect(doc_show.postTitleHidden).toBe('my-title-3')
+    })
+
     it('should allow virtual field as reference to ID', async () => {
       const post = await payload.create({ collection: 'posts', data: { title: 'my-title' } })
       const { id } = await payload.create({