fix: fallback to any known node when control node not found by endpoint

When the control connection endpoint doesn't match any node in metadata
(e.g. with PrivateLink or proxy setups), fall back to the first available
node instead of immediately throwing an exception.

Author: dkropachev

core/src/main/java/com/datastax/oss/driver/internal/core/metadata/schema/queries/DefaultSchemaQueriesFactory.java

@@ -51,12 +51,16 @@ public SchemaQueries newInstance() {
             .getMetadataManager()
             .getMetadata()
             .findNode(channel.getEndPoint())
-            .orElseThrow(
+            .orElseGet(
                 () ->
-                    new IllegalStateException(
-                        "Could not find control node metadata "
-                            + channel.getEndPoint()
-                            + ", aborting schema refresh"));
+                    context.getMetadataManager().getMetadata().getNodes().values().stream()
+                        .findFirst()
+                        .orElseThrow(
+                            () ->
+                                new IllegalStateException(
+                                    "Could not find control node metadata "
+                                        + channel.getEndPoint()
+                                        + ", aborting schema refresh")));
     return newInstance(node, channel);
   }