Disable reindex test against 0.90 on mac

Follow-up to elastic#51449 to also disable the test on mac.

Closes elastic#51617

modules/reindex/src/test/java/org/elasticsearch/index/reindex/remote/ReindexFromOldRemoteIT.java

@@ -21,6 +21,7 @@
 
 import org.apache.http.HttpHost;
 import org.apache.http.util.EntityUtils;
+import org.apache.lucene.util.Constants;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.Response;
 import org.elasticsearch.client.RestClient;
@@ -117,6 +118,7 @@ public void testEs1() throws IOException {
     }
 
     public void testEs090() throws IOException {
+        assumeFalse("No longer works on Mac", Constants.MAC_OS_X);
         oldEsTestCase("es090.port", null);
     }
 
@@ -129,6 +131,7 @@ public void testEs1WithFunnyThrottle() throws IOException {
     }
 
     public void testEs090WithFunnyThrottle() throws IOException {
+        assumeFalse("No longer works on Mac", Constants.MAC_OS_X);
         oldEsTestCase("es090.port", "11"); // 11 requests per second should give us a nice "funny" number on the scroll timeout
     }