Add comment for ConnectionRemoteTest

Author: alinaliBQ

cpp/src/arrow/flight/sql/odbc/tests/connection_test.cc

@@ -32,6 +32,7 @@ class ConnectionTest : public T {
   using List = std::list<T>;
 };
 
+// GH-46574 TODO: add remote server test cases using `ConnectionRemoteTest`
 class ConnectionRemoteTest : public FlightSQLODBCRemoteTestBase {};
 using TestTypes = ::testing::Types<FlightSQLODBCMockTestBase, ConnectionRemoteTest>;
 TYPED_TEST_SUITE(ConnectionTest, TestTypes);