Fix springdoc so that enums names are used instead of toString

This fixes bug where some apis will not execute correctly from the swagger pager due to the wrong enum value being supplied.
i.e.
visibility should be using enum values PUBLIC/PRIVATE instead of public/private
in formatters/zip api, the format should be SIMPLE/PARTIAL/FULL instead of simple/partial/full

services/src/main/java/org/fao/geonet/api/OpenApiController.java

@@ -21,7 +21,11 @@
 package org.fao.geonet.api;
 
 import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.databind.SerializationFeature;
+
+import io.swagger.v3.core.util.Json;
 import io.swagger.v3.core.util.PathUtils;
+import io.swagger.v3.core.util.Yaml;
 import io.swagger.v3.oas.annotations.Operation;
 import io.swagger.v3.oas.models.OpenAPI;
 import org.springdoc.api.AbstractOpenApiResource;
@@ -105,6 +109,10 @@ public OpenApiController(ObjectFactory<OpenAPIService> openAPIBuilderObjectFacto
         this.servletContextProvider = servletContextProvider;
         this.springSecurityOAuth2Provider = springSecurityOAuth2Provider;
         this.routerFunctionProvider = routerFunctionProvider;
+
+        // Ensure all enums are written based on the enum name.
+        Json.mapper().configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, false);
+        Yaml.mapper().configure(SerializationFeature.WRITE_ENUMS_USING_TO_STRING, false);
     }
 
     @Operation(hidden = true)