[INTERNAL] minify: Omit .js.map from build results

Source maps are currently only required during the build process
(e.g. for creating source maps of bundles) but not as build output.
Therefore they will be omitted from the build result.

lib/tasks/minify.js

@@ -20,6 +20,7 @@ module.exports = async function({workspace, taskUtil, options: {pattern}}) {
 		if (taskUtil) {
 			taskUtil.setTag(resource, taskUtil.STANDARD_TAGS.HasDebugVariant);
 			taskUtil.setTag(dbgResource, taskUtil.STANDARD_TAGS.IsDebugVariant);
+			taskUtil.setTag(sourceMapResource, taskUtil.STANDARD_TAGS.OmitFromBuildResult);
 		}
 		return Promise.all([
 			workspace.write(resource),