import: improve create missing categories

config/services.yaml

src/Admin/ImportAdmin.php

...troller/Admin/BulkActions/DuplicatesActionsController.php

src/Controller/Admin/ImportAdminController.php

src/Document/Category.php

src/Document/Import.php

src/Document/Option.php

src/Document/Taxonomy.php

src/EventListener/TaxonomyJsonGenerator.php

src/Services/ElementImportMappingService.php

src/Services/ElementImportOneService.php

src/Services/ElementImportService.php

src/Utils.php

...dmin/core_custom/custom-fields/mapping-ontology.html.twig

...dmin/core_custom/custom-fields/mapping-taxonomy.html.twig

web/index.php