Switch test runner to childProcess (#17571)

jest.config.js

@@ -65,7 +65,7 @@ const config = {
     "<rootDir>/tests/config/format-test-setup.js",
     "<rootDir>/tests/integration/integration-test-setup.js",
   ],
-  runner: "jest-light-runner",
+  runner: "jest-light-runner/child-process",
   snapshotSerializers: [
     "jest-snapshot-serializer-raw",
     "jest-snapshot-serializer-ansi",