Remove unused BeforeEach import from ContentUnderstandingClientTestBase

The @beforeeach annotation is not used in the base class, only in the Sample test classes that extend it. Removing the unused import to fix linting error.

Author: Changjian Wang

sdk/contentunderstanding/azure-ai-contentunderstanding/src/test/java/com/azure/ai/contentunderstanding/generated/ContentUnderstandingClientTestBase.java

@@ -17,7 +17,6 @@
 import com.azure.core.test.utils.MockTokenCredential;
 import com.azure.core.util.Configuration;
 import com.azure.identity.DefaultAzureCredentialBuilder;
-import org.junit.jupiter.api.BeforeEach;
 import org.opentest4j.TestAbortedException;
 
 class ContentUnderstandingClientTestBase extends TestProxyTestBase {