build: take advantage of upstream static asset build improvements

TODOs:
* See if we can reduce the huge mount blocks a bit.
* Merge edx-platform asset folder changes instead of patching in a PR.
* Add changelog entry.
* Test more thoroughly.
* Circulate a TEP or some other form of proposal.
* Deprecate patches that no longer exist or have changed.
* Announce that buildkit is required (or pull that into a separate PR).

Part of: https://github.com/openedx/wg-developer-experience/issues/166

tutor/commands/images.py

@@ -34,7 +34,9 @@ def _add_core_images_to_build(
                 image,
                 os.path.join("build", image),
                 tutor_config.get_typed(config, tag, str),
-                (),
+                (
+                    "--target=production",
+                ),
             )
         )