tests: Add test scenario for VL53L1X distance sensor.

Add a YAML test scenario file `tests/scenarios/vl53l1x.yaml` for the VL53L1X driver.

### Expected tests
- **Mock**: verify device ID register
- **Hardware**: read distance measurement
- **Manual**: validate displayed distance value

### Reference
- Driver: `lib/vl53l1x/`
- Test framework: PR #28