Added Directive [SPACE] Commit Character

Fixes: https://github.com/dotnet/aspnetcore/issues/22886

src/Razor/src/Microsoft.AspNetCore.Razor.LanguageServer/Completion/RazorCompletionEndpoint.cs

@@ -248,6 +248,7 @@ internal bool TryConvert(RazorCompletionItem razorCompletionItem, out Completion
                             SortText = razorCompletionItem.DisplayText,
                             Documentation = descriptionInfo.Description,
                             Kind = CompletionItemKind.Struct,
+                            CommitCharacters = new Container<string>(razorCompletionItem.CommitCharacters),
                         };
 
                         if (razorCompletionItem == DirectiveAttributeTransitionCompletionItemProvider.TransitionCompletionItem)

src/Razor/src/Microsoft.CodeAnalysis.Razor.Workspaces/Completion/DirectiveCompletionItemProvider.cs

@@ -108,7 +108,8 @@ internal static List<RazorCompletionItem> GetDirectiveCompletionItems(RazorSynta
                 var completionItem = new RazorCompletionItem(
                     completionDisplayText,
                     directive.Directive,
-                    RazorCompletionItemKind.Directive);
+                    RazorCompletionItemKind.Directive,
+                    new string[] { " " });
                 var completionDescription = new DirectiveCompletionDescription(directive.Description);
                 completionItem.SetDirectiveCompletionDescription(completionDescription);
                 completionItems.Add(completionItem);

src/Razor/test/Microsoft.CodeAnalysis.Razor.Workspaces.Test/Completion/DirectiveCompletionItemProviderTest.cs

@@ -289,6 +289,7 @@ private static void AssertRazorCompletionItem(string completionDisplayText, Dire
             Assert.Equal(item.InsertText, directive.Directive);
             var completionDescription = item.GetDirectiveCompletionDescription();
             Assert.Equal(directive.Description, completionDescription.Description);
+            Assert.Single(item.CommitCharacters, " ");
         }
 
         private static void AssertRazorCompletionItem(DirectiveDescriptor directive, RazorCompletionItem item) =>