fix: <Select disabled> for type: string + enum schemas (#5601)

* fix: pass `disabled` through JsonSchemaForm – JsonSchema_string – Select

* migrate 5452 regression test

src/core/json-schema-components.jsx

@@ -78,6 +78,7 @@ export class JsonSchema_string extends Component {
                       allowedValues={ enumValue }
                       value={ value }
                       allowEmptyValue={ !required }
+                      disabled={disabled}
                       onChange={ this.onEnumChange }/>)
     }