message: fix(build): ignore dev-env-only styles
  This change excludes dev-env-only `.scss` file from the list of `.scss`
  file to be copied to shipping directory (`scss` directory in the
  `carbon-custom-elements` package).
diff: @@ -213,6 +213,6 @@ module.exports = {
  },
  sass() {
  - return gulp.src(`${config.srcDir}/**/*.scss`).pipe(gulp.dest(config.sassDestDir));
  + return gulp.src([`${config.srcDir}/**/*.scss`, `!${config.srcDir}/**/*-story.scss`]).pipe(gulp.dest(config.sassDestDir));
  },
  };
  