Mark long running tests as live-only (Azure#25782)

Author: JoshLove-msft

sdk/search/Azure.Search.Documents/tests/Samples/Sample05_IndexingDocuments.cs

@@ -111,6 +111,7 @@ await indexClient.CreateIndexAsync(
 
         [Test]
         [IgnoreOnNet5("https://github.com/Azure/azure-sdk-for-net/issues/16963")]
+        [LiveOnly]
         public async Task SimpleIndexing()
         {
             await using SearchResources resources = SearchResources.CreateWithNoIndexes(this);
@@ -157,6 +158,7 @@ public async Task SimpleIndexing()
         }
 
         [Test]
+        [LiveOnly]
         public async Task BufferedSender()
         {
             await using SearchResources resources = SearchResources.CreateWithNoIndexes(this);