layout_image: Include missing request settings in layout-initiated image loads (#36621)

This PR updates the `fetch_image_for_layout` function to include missing
security-related request settings:

- `insecure_requests_policy`
- `has_trustworthy_ancestor_origin`
- `policy_container`

---
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- [X] `./mach build -d` does not report any errors
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- [X] These changes fix #36591

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- [X] There are tests for these changes

Signed-off-by: Emmanuel Elom <elomemmanuel007@gmail.com>

components/script/layout_image.rs

@@ -119,7 +119,10 @@ pub(crate) fn fetch_image_for_layout(
     )
     .origin(document.origin().immutable().clone())
     .destination(Destination::Image)
-    .pipeline_id(Some(document.global().pipeline_id()));
+    .pipeline_id(Some(document.global().pipeline_id()))
+    .insecure_requests_policy(document.insecure_requests_policy())
+    .has_trustworthy_ancestor_origin(document.has_trustworthy_ancestor_origin())
+    .policy_container(document.policy_container().to_owned());
 
     // Layout image loads do not delay the document load event.
     document.fetch_background(request, context);