message: Fix Parent descriptors don't overwrite children
  Ensure each descriptor-based react-jsonschema-form (rjsf) ui schema config is merged so that existing values don't get overwritten or removed.
diff: @@ -155,7 +155,7 @@ export const descriptorsToUISchema = (
  mutable.setIn(pathToAdvanced, currentAdvanced.push(advancedPropertyName));
  }
  - mutable.setIn(
  + mutable.mergeDeepIn(
  uiSchemaPath,
  Immutable.Map({
  ...(descriptor.description && { 'ui:description': descriptor.description }),
  