build: copy in copy-node-modules.sh for npm post-install hook

This post-install hook replaces `openedx-assets npm`.

Part of: openedx/edx-platform#31604

tutor/templates/build/openedx/Dockerfile

@@ -123,6 +123,8 @@ RUN nodeenv /openedx/nodeenv --node=16.14.0 --prebuilt
 # Install nodejs requirements
 ARG NPM_REGISTRY={{ NPM_REGISTRY }}
 WORKDIR /openedx/edx-platform
+RUN mkdir -p scripts
+COPY --from=edx-platform scripts/copy-node-modules.sh scripts
 RUN {% if is_buildkit_enabled() %}--mount=type=bind,from=edx-platform,source=/package.json,target=/openedx/edx-platform/package.json \
     --mount=type=bind,from=edx-platform,source=/package-lock.json,target=/openedx/edx-platform/package-lock.json \
     --mount=type=cache,target=/root/.npm,sharing=shared {% endif %}npm clean-install --no-audit --registry=$NPM_REGISTRY
@@ -205,7 +207,6 @@ ENV NO_PREREQ_INSTALL 1
 # For instance, we don't want to run all steps of asset collection every time the theme
 # is modified.
 RUN openedx-assets xmodule \
-    && openedx-assets npm \
     && openedx-assets webpack --env=prod \
     && openedx-assets common
 COPY --chown=app:app ./themes/ /openedx/themes/