Validation issue with data models containing hyphens in their names

[mlqn]

Description of the bug

newtest is considered as valid by frontend but invalid by backend if new-test already exists.

data-model-with-hyphen-2.mov

This validation mismatch occurs because the hyphen is removed only on backend :

altinn-studio/backend/src/DataModeling/Converter/Metadata/JsonSchemaToMetamodelConverter.cs

Line 568 in 7840b40

return name.Replace("-", string.Empty);

A possible solution could be to mark - as an invalid character when creating a new data model