test: ignore coverage on data-center package

It will be removed soon.

vitest.config.ts

@@ -26,6 +26,10 @@ export default defineConfig({
       provider: 'istanbul', // or 'c8'
       reporter: ['lcov'],
       reportsDirectory: '.coverage/store',
+      exclude: [
+        // data center will be removed in the future
+        'packages/data-center',
+      ],
     },
   },
 });