Enhance error logging for image store retrieval failure

Co-authored-by: Copilot Autofix powered by AI <175728472+Copilot@users.noreply.github.com>

Author: erikbocks

server/src/main/java/com/cloud/template/TemplateManagerImpl.java

@@ -2481,7 +2481,7 @@ public VirtualMachineTemplate linkUserDataToTemplate(LinkUserDataToTemplateCmd c
     }
 
     private void throwExceptionForImageStoreObtentionFailure(Long zoneId, String operation) {
-        logger.error("Cannot find an image store for zone [{}].", zoneId);
+        logger.error("Cannot find an image store for zone [{}] while trying to {}.", zoneId, operation);
         throw new CloudRuntimeException(String.format("Failed to %s. Please contact the cloud administrator.", operation));
     }
 }