Error message from SR propagation (#4058)

Co-authored-by: iliax <ikuramshin@provectus.com>

kafka-ui-api/src/main/java/com/provectus/kafka/ui/service/SchemaRegistryService.java

@@ -125,7 +125,7 @@ public class SchemaRegistryService {
         .onErrorMap(WebClientResponseException.Conflict.class,
             th -> new SchemaCompatibilityException())
         .onErrorMap(WebClientResponseException.UnprocessableEntity.class,
-            th -> new ValidationException("Invalid schema"))
+            th -> new ValidationException("Invalid schema. Error from registry: " + th.getResponseBodyAsString()))
         .then(getLatestSchemaVersionBySubject(cluster, subject));
   }