message: Fix sample-code test script for directory changes
diff: "cleanbackend": "rimraf lib out/backend",
  "copybackendassets": "cpx ./backend_test_assets/**/* ./out/backend/assets",
  "pretestbackend": "npm run copybackendassets && rush build",
  - "testbackend": "npm run pretestbackend && node ../../node_modules/@bentley/bentleyjs-tools/scripts/test --packageRoot=\"../../\" --testDir=\"./out/backend\"",
  + "testbackend": "npm run pretestbackend && node ../node_modules/@bentley/bentleyjs-tools/scripts/test --packageRoot=\"../\" --testDir=\"./out/backend\"",
  "buildfrontend": "cd ./frontend && tsc --outDir ../out/frontend",
  "cleanfrontend": "rimraf lib out/frontend",
  "buildcommon": "cd ./common && tsc --outDir ../out/common",
  