test: update unused tests

Author: diegomarquezp

sdk-platform-java/gax-java/gax/src/test/java/com/google/api/gax/tracing/ErrorTypeUtilTest.java

@@ -46,7 +46,6 @@
 import java.net.SocketTimeoutException;
 import java.net.UnknownHostException;
 import java.security.GeneralSecurityException;
-import java.util.concurrent.ExecutionException;
 import javax.net.ssl.SSLHandshakeException;
 import org.junit.jupiter.api.Test;
 
@@ -195,14 +194,6 @@ class UnknownClientException extends Exception {}
         .isEqualTo("UnknownClientException");
   }
 
-  @Test
-  void testExtractErrorType_executionException_unwraps() {
-    Exception cause = new ConnectException("refused");
-    Exception wrapper = new ExecutionException(cause);
-    assertThat(ErrorTypeUtil.extractErrorType(wrapper))
-        .isEqualTo(ErrorTypeUtil.ErrorType.CLIENT_CONNECTION_ERROR.toString());
-  }
-
   @Test
   void testExtractErrorType_uncheckedExecutionException_unwraps() {
     Exception cause = new SocketTimeoutException("timeout");