Fix the testall npm script (#32081)

`yarn test` has been removed by #32042, so it should be replaced by the other test scripts.

package.json

@@ -15,7 +15,6 @@
     "test-unit": "yarn jest test/unit/",
     "testonly": "yarn jest --runInBand",
     "testheadless": "cross-env HEADLESS=true yarn testonly",
-    "testall": "yarn test -- --ci --forceExit && lerna run --scope @next/codemod test",
     "genstats": "cross-env LOCAL_STATS=true node .github/actions/next-stats-action/src/index.js",
     "git-reset": "git reset --hard HEAD",
     "git-clean": "git clean -d -x -e node_modules -e packages -f",