test: use single file tests as jest entries

Author: LingyuCoder

package.json

@@ -42,7 +42,7 @@
     "prepare": "is-ci || husky",
     "test:diff": "pnpm --filter \"@rspack/*\" test:diff",
     "test:hot": "pnpm --filter \"@rspack/*\" test:hot",
-    "test:unit": "pnpm --parallel --filter \"@rspack/*\" test",
+    "test:unit": "pnpm --sequential --filter \"@rspack/*\" test",
     "test:e2e": "pnpm --filter \"e2e-test\" test",
     "test:ci": "cross-env NODE_OPTIONS=--max_old_space_size=8192 pnpm run build:js && pnpm run test:unit && pnpm test:webpack",
     "test:webpack": "pnpm --filter \"webpack-test\" test:metric",
@@ -104,4 +104,4 @@
       "esbuild"
     ]
   }
-}
+}