Setup validation stamp with data-type fails

When running:
```
./ontrack-cli validation-stamp setup --project project-name --branch release-1.0.0 --validation new  \
  --data-type net.nemerosa.ontrack.extension.general.validation.CHMLValidationDataType \
  --data-config '{warningLevel: {level: "HIGH",value:1},failedLevel:{level:"CRITICAL",value:1}}'
```
We get an error:
```
Error: unknown flag: --data-type
```