fix the test CI (#1405)

* run tests without concurrency

* do not use cache in rpt2 during test

packages/rrdom/test/utils.ts

@@ -13,6 +13,7 @@ export async function compileTSCode(inputFilePath: string) {
       resolve() as unknown as rollup.Plugin,
       _typescript({
         tsconfigOverride: { compilerOptions: { module: 'ESNext' } },
+        clean: true,
       }) as unknown as rollup.Plugin,
     ],
   });