Add internalClusterTest to check task (elastic#53444)

This commit adds internalClusterTest in xpack core to run as part of
check. This was accidentally removed in a refactoring. Other xpack
modules already do this, but core was left out. This commit also mutes 2
tests that currently fail.

closes elastic#53407

x-pack/plugin/core/build.gradle

@@ -152,3 +152,4 @@ integTest.enabled = false
 task internalClusterTest(type: Test) {
   include "**/*IT.class"
 }
+check.dependsOn internalClusterTest

x-pack/plugin/core/src/test/java/org/elasticsearch/xpack/core/rest/action/ReloadSynonymAnalyzerIT.java

@@ -5,6 +5,7 @@
  */
 package org.elasticsearch.xpack.core.rest.action;
 
+import org.apache.lucene.util.LuceneTestCase;
 import org.elasticsearch.action.admin.indices.analyze.AnalyzeAction.AnalyzeToken;
 import org.elasticsearch.action.admin.indices.analyze.AnalyzeAction.Response;
 import org.elasticsearch.action.search.SearchResponse;
@@ -39,6 +40,7 @@
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertHitCount;
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertNoFailures;
 
+@LuceneTestCase.AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/53443")
 public class ReloadSynonymAnalyzerIT extends ESIntegTestCase {
 
     @Override