Fix SamlServiceProviderDocumentTests (#54718)

Don't assume byte for byte equality because internal structures
 do not guarantee order

Author: jkakavas

x-pack/plugin/identity-provider/src/test/java/org/elasticsearch/xpack/idp/saml/sp/SamlServiceProviderDocumentTests.java

@@ -30,6 +30,7 @@
 import java.util.Set;
 import java.util.stream.Collectors;
 
+import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertToXContentEquivalent;
 import static org.hamcrest.Matchers.emptyIterable;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.not;
@@ -144,7 +145,7 @@ private SamlServiceProviderDocument assertXContentRoundTrip(SamlServiceProviderD
             assertThat(obj2, equalTo(obj1));
 
             final BytesReference bytes2 = XContentHelper.toXContent(obj2, xContentType, humanReadable);
-            assertThat(bytes2, equalTo(bytes1));
+            assertToXContentEquivalent(bytes1, bytes2, xContentType);
 
             return obj2;
         }