Fix component name for ClusterState custom (#14477)

Signed-off-by: Shivansh Arora <hishiv@amazon.com>

Author: shiv0408

server/src/main/java/org/opensearch/gateway/remote/RemoteClusterStateService.java

@@ -1160,7 +1160,8 @@ private ClusterState readClusterStateInParallel(
         for (Map.Entry<String, UploadedMetadataAttribute> entry : clusterStateCustomToRead.entrySet()) {
             asyncMetadataReadActions.add(
                 remoteClusterStateAttributesManager.getAsyncMetadataReadAction(
-                    CLUSTER_STATE_CUSTOM,
+                    // pass component name as cluster-state-custom--<custom_name>, so that we can interpret it later
+                    String.join(CUSTOM_DELIMITER, CLUSTER_STATE_CUSTOM, entry.getKey()),
                     new RemoteClusterStateCustoms(
                         entry.getValue().getUploadedFilename(),
                         entry.getValue().getAttributeName(),