Fixing completion commit chars (#10533)

We don't need to (and shouldn't) specify AllCommitCharacters in capabilities for our completion endpoint. Doing so causes them to always be added to all completion items.

Since we are using our completion endoint for VSCode now, it was causing undesirable behavior there. VSCode HTML doesn't use ">"  as the commit character, and having it specified in server capabilities was causing us to always use ":", ">", " ", and "=" as the commit characters for all items.

See microsoft/vscode#217772

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

@@ -38,7 +38,6 @@ public void ApplyCapabilities(VSInternalServerCapabilities serverCapabilities, V
         {
             ResolveProvider = true,
             TriggerCharacters = _completionListProvider.AggregateTriggerCharacters.ToArray(),
-            AllCommitCharacters = new[] { ":", ">", " ", "=" },
         };
     }