refactor: add copyright header to ClientServerMethodsSupportTest

- Added Apache 2.0 license header with 2026 copyright
- Added SPDX-License-Identifier: Apache-2.0
- Lines added: 17, lines removed: 0

Author: ttmunyunguma

yoko-verify/src/test/java-testify/org/omg/PortableInterceptor/ClientServerMethodsSupportTest.java

@@ -1,3 +1,20 @@
+/*
+ * Copyright 2026 IBM Corporation and others.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ */
 package org.omg.PortableInterceptor;
 
 import acme.Echo;