For SpaSitePipeline mounts, suppress the AutoReloadResponseAppender

The SpaPipeline response for local development does include the webfiles reloading logic and trying to use ws socket for changes. We can better suppress this for the SpaPipeline because I suspect this might interfere with the SPA (although we can also postpone this and see whether this is really a problem or not)

The appending is done by org.hippoecm.hst.core.autoreload.AutoReloadResponseAppender and includes javascript in the response for the ws socket reloading. Most likely we need to suppress this