fix: drop @darraghor/eslint-plugin-nestjs-typed to fix CI Node version issue
The plugin pulls @typescript-eslint@8.57.0 which requires Node ^22.13.0,
breaking CI on 22.12.0. Removed along with typescript-eslint and the
per-example eslint config - root eslint config covers the example.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>