fix(jsonld): allow mapping collection output with itemUriTemplate

[soyuka]

Q	A
Branch?	4.2
Tickets	na
License	MIT
Doc PR	na

When using a collection operation with a custom output DTO and itemUriTemplate, the IRI
generation was failing because the system couldn't properly resolve IRIs for mapped
objects that aren't directly registered as API resources.

This enables scenarios where you want different representations for collection vs item
operations:

 #[GetCollection(
     output: BookStoreCollection::class,
     itemUriTemplate: '/book_store_resources/{id}{._format}',
 )]

The collection returns a lightweight DTO while individual items can be accessed with full
details.