This continues the work on https://lab.nexedi.com/nexedi/slapos/-/merge_requests/1555
Drop hidden fields, ingested option and restructure to use object types.
Most of the work is to improve the way data is validated to avoid duplication and other miss-behavior from the parameter editor.
It drops non JSON Schema standard features (hidden and template) and use object key based structures instead const+template, since it provides better behavior whenever render the form. (so user don't have to manually input the value, like current behavior).
Using objects, only fills structured values once the subform has a value inputted (or set), so it don't pollute of modifies the data just by rendering the form.
It is required to still update instance and tests for follow up the change.