Reenable Parallel Restore Test on Windows

* As a result of elastic#44096 this test shouldn't fail anymore on `master` and `7.4`+ so we should reenable it there
  * For older versions we won't backport that change so the tests should stay disabled there
* Closes elastic#44671

server/src/test/java/org/elasticsearch/snapshots/SharedClusterSnapshotRestoreIT.java

@@ -19,7 +19,6 @@
 
 package org.elasticsearch.snapshots;
 
-import org.apache.lucene.util.Constants;
 import org.apache.lucene.util.SetOnce;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.ExceptionsHelper;
@@ -3800,7 +3799,6 @@ public void testParallelRestoreOperations() {
     }
 
     public void testParallelRestoreOperationsFromSingleSnapshot() throws Exception {
-        assumeFalse("https://github.com/elastic/elasticsearch/issues/44671", Constants.WINDOWS);
         String indexName1 = "testindex1";
         String indexName2 = "testindex2";
         String repoName = "test-restore-snapshot-repo";