Skip test until concurrent multi-user IME is enabled

Bug: 345557347
Test: tested on cf_x86_64_only_auto_md emulator
Test: atest ConcurrentMultiUserTest
Change-Id: I7288e775ae085bb3bbdacf1b7b37766b340b02d6

tests/inputmethod/ConcurrentMultiSessionImeTest/src/com/android/server/inputmethod/multisessiontest/ConcurrentMultiUserTest.java

@@ -39,11 +39,13 @@ import com.android.bedstead.harrier.DeviceState;
 import org.junit.After;
 import org.junit.Before;
 import org.junit.ClassRule;
+import org.junit.Ignore;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 
 @RunWith(BedsteadJUnit4.class)
+@Ignore("b/345557347")
 public final class ConcurrentMultiUserTest {
 
     @ClassRule