Remove unnecessary "throws" declarations

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=201058582

javatests/google/registry/rde/BrdaCopyActionTest.java

@@ -123,7 +123,7 @@ public class BrdaCopyActionTest extends ShardableTestCase {
   }
 
   @Test
-  public void testRun() throws Exception {
+  public void testRun() {
     action.run();
     assertThat(gcsUtils.existsAndNotEmpty(STAGE_FILE)).isTrue();
     assertThat(gcsUtils.existsAndNotEmpty(RYDE_FILE)).isTrue();