Check SQL dependency in super class for SqlIntegrationMembershipTest (#398)

In some cases, we define JpaTransactionManagerRule in a TestCase
class which is extended by the concrete test class. So, we need
to check if JpaTransactionManagerRule is also defined in the super
class.

core/src/test/java/google/registry/schema/integration/SqlIntegrationMembershipTest.java

@@ -71,8 +71,13 @@ public class SqlIntegrationMembershipTest {
   }
 
   private static boolean isSqlDependent(Class<?> testClass) {
-    return Stream.of(testClass.getDeclaredFields())
-        .map(Field::getType)
-        .anyMatch(JpaTransactionManagerRule.class::equals);
+    for (Class<?> clazz = testClass; clazz != null; clazz = clazz.getSuperclass()) {
+      if (Stream.of(clazz.getDeclaredFields())
+          .map(Field::getType)
+          .anyMatch(JpaTransactionManagerRule.class::equals)) {
+        return true;
+      }
+    }
+    return false;
   }
 }