Suppress debug representations of network response bodies (#38789)

Adds a wrapper type for vectors that can contain large response bodies
to prevent flooding debug logs with the contents of those bodies.

Testing: Can't test debug log output.
Fixes: #37769

---------

Signed-off-by: Josh Matthews <josh@joshmatthews.net>

components/script/dom/html/htmlimageelement.rs

@@ -298,7 +298,7 @@ impl FetchResponseListener for ImageContext {
         if self.status.is_ok() {
             self.image_cache.notify_pending_response(
                 self.id,
-                FetchResponseMsg::ProcessResponseChunk(request_id, payload),
+                FetchResponseMsg::ProcessResponseChunk(request_id, payload.into()),
             );
         }
     }