Ignore MultiUserRollbackTest#testBadUpdateRollback

This test is flaky so we should ignore it for now

Test: presubmit
Bug: 257005776
Change-Id: I8dfa0e59427a5abc78e96c72032d840355f00924

tests/RollbackTest/MultiUserRollbackTest/src/com/android/tests/rollback/host/MultiUserRollbackTest.java

@@ -25,6 +25,7 @@ import com.android.tradefed.testtype.junit4.BaseHostJUnit4Test;
 
 import org.junit.After;
 import org.junit.Before;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
@@ -98,6 +99,7 @@ public class MultiUserRollbackTest extends BaseHostJUnit4Test {
     }
 
     @Test
+    @Ignore
     public void testBadUpdateRollback() throws Exception {
         // Need to switch user in order to send broadcasts in device tests
         assertTrue(getDevice().switchUser(mSecondaryUserId));