Reenable Integ Tests in native-multi-node-tests (#45482)

* Reenable Integ Tests in native-multi-node-tests

* The tests broken here were likely fixed by #45463 => let's reenable them and see if things run fine again
* Relates #45405, #45455

x-pack/plugin/ml/qa/native-multi-node-tests/build.gradle

@@ -27,10 +27,6 @@ task copyKeyCerts(type: Copy) {
 sourceSets.test.resources.srcDir(keystoreDir)
 processTestResources.dependsOn(copyKeyCerts)
 
-// Disabled and tracked here https://github.com/elastic/elasticsearch/issues/45405
-integTest.enabled = false
-testingConventions.enabled = false
-
 integTest {
     dependsOn copyKeyCerts
     runner {