feat: Add with-otel example with pre-configured Grafana dashboard (#12043)
## Summary
- Moves `examples/local-otel-collector` to `examples/with-otel` and
transforms it into a standard Turborepo example following the
`create-turbo` pattern
- Adds a pre-configured Grafana dashboard so users see Turborepo metrics
immediately after `docker compose up -d` -- no manual datasource or
dashboard setup required
## Try it
```sh
npx create-turbo@latest \
-e https://github.com/vercel/turborepo/tree/shew/otel-collector-friendly-example \
-p examples/with-otel
```
## Testing
```sh
cd with-otel
pnpm install
docker compose up -d
# macOS / Linux
export TURBO_EXPERIMENTAL_OTEL_ENABLED=1
export TURBO_EXPERIMENTAL_OTEL_ENDPOINT=https://127.0.0.1:4317
export TURBO_EXPERIMENTAL_OTEL_RESOURCE="service.name=turborepo,env=local"
export TURBO_EXPERIMENTAL_OTEL_METRICS_TASK_DETAILS=1
turbo build
# Open http://localhost:3001 to see the Grafana dashboard
```
---------
Co-authored-by: Vercel <vercel[bot]@users.noreply.github.com>
turbo
d47c6c7e - feat: Add with-otel example with pre-configured Grafana dashboard (#12043)
