feat(onboarding): split public in two steps

src/app/form/form-view/form-view.component.ts

...rm/form-view/structure-form/structure-form.component.html

...form/form-view/structure-form/structure-form.component.ts

...ture-public-target/structure-public-target.component.html

...ucture-public-target/structure-public-target.component.ts

...p/form/form-view/structure-form/structureFormStep.enum.ts

...-edition-summary/structure-edition-summary.component.html

src/app/utils/formUtils.ts