lint fix

Author: toddmeng-db

csharp/test/Drivers/Databricks/Auth/OAuthClientCredentialsServiceTests.cs

@@ -1,8 +1,24 @@
+/*
+* Licensed to the Apache Software Foundation (ASF) under one or more
+* contributor license agreements.  See the NOTICE file distributed with
+* this work for additional information regarding copyright ownership.
+* The ASF licenses this file to You 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.
+*/
+
 using System;
 using System.Threading;
 using System.Threading.Tasks;
 using Apache.Arrow.Adbc.Drivers.Databricks.Auth;
-using Apache.Arrow.Adbc.Tests.Drivers.Databricks;
 using Xunit;
 using Xunit.Abstractions;