Fix anchors for schemas under `oneOf` (#1799)

Signed-off-by: Kévin Commaille <zecakeh@tedomum.fr>

changelogs/internal/newsfragments/1799.clarification

@@ -0,0 +1 @@
+Fix anchors for schemas under `oneOf`.

layouts/partials/json-schema/resolve-additional-types.html

@@ -165,6 +165,7 @@
      * (https://json-schema.org/understanding-json-schema/reference/combining.html#oneof)
      */
     {{ if $this_object.oneOf }}
+        {{ $updated_items := slice }}
         {{ range $idx, $item := $this_object.oneOf }}
             {{ $res := partial "get-additional-objects" (dict
                 "this_object" $item
@@ -173,7 +174,11 @@
                 "name" (printf "%s.oneOf[%d]" $name $idx)
             ) }}
             {{ $all_objects = $res.objects }}
+            {{ $updated_items = $updated_items | append $res.schema }}
         {{ end }}
+
+        /* Update the top-level schema with the updated subschemas for the items */
+        {{ $this_object = merge $this_object (dict "oneOf" $updated_items) }}
     {{ end }}
 
     {{ return (dict