fix(csharp/src/Drivers/Apache): Fix setting foreign schema/table in GetCrossReference (#2765)

Currently, calling GetCrossReference with just ForeignCatalogName,
ForeignSchemaName, and ForeignTableName parameters fails because these
parameters aren't properly set on the Thrift request.

This PR fixes the typo

Tested E2E locally and it works
```
          statement.SqlQuery = "getcrossreference";
          statement.SetOption(ApacheParameters.IsMetadataCommand, "true");
          statement.SetOption(ApacheParameters.ForeignCatalogName, "powerbi");
          statement.SetOption(ApacheParameters.ForeignSchemaName, "default");
          statement.SetOption(ApacheParameters.ForeignTableName, "nyc_taxi_tripdata");
```

Author: alexguo-db

csharp/src/Drivers/Apache/Hive2/HiveServer2Connection.cs

@@ -1139,11 +1139,11 @@ internal async Task<TGetCrossReferenceResp> GetCrossReferenceAsync(
             {
                 req.ForeignCatalogName = foreignCatalogName!;
             }
-            if (schemaName != null)
+            if (foreignSchemaName != null)
             {
                 req.ForeignSchemaName = foreignSchemaName!;
             }
-            if (tableName != null)
+            if (foreignTableName != null)
             {
                 req.ForeignTableName = foreignTableName!;
             }