Re-enable the RemoteClusterSecurityBwcRestIT (#106052)

Jdk 22 had test failures which caused this test to be muted. It looks
like this bwc test may have failed because earlier ES versions had not
yet had the necessary change to Terminal backported yet. That should be
fixed now with #106049 and #106051. This commit re-enables the bwc test.

relates #104858

x-pack/plugin/security/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/xpack/remotecluster/RemoteClusterSecurityBwcRestIT.java

@@ -7,7 +7,6 @@
 
 package org.elasticsearch.xpack.remotecluster;
 
-import org.apache.lucene.tests.util.LuceneTestCase;
 import org.elasticsearch.action.search.SearchResponse;
 import org.elasticsearch.client.Request;
 import org.elasticsearch.client.RequestOptions;
@@ -41,7 +40,6 @@
 /**
  * BWC test which ensures that users and API keys with defined {@code remote_indices} privileges can be used to query legacy remote clusters
  */
-@LuceneTestCase.AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/104858")
 public class RemoteClusterSecurityBwcRestIT extends AbstractRemoteClusterSecurityTestCase {
 
     private static final Version OLD_CLUSTER_VERSION = Version.fromString(System.getProperty("tests.old_cluster_version"));