Handle failed progress tasks as completed in CLI

Closes #988

DiscordChatExporter.Cli/Commands/Base/ExportCommandBase.cs

@@ -150,7 +150,8 @@ public abstract class ExportCommandBase : TokenCommandBase
                 {
                     try
                     {
-                        await progressContext.StartTaskAsync($"{channel.Category.Name} / {channel.Name}",
+                        await progressContext.StartTaskAsync(
+                            $"{channel.Category.Name} / {channel.Name}",
                             async progress =>
                             {
                                 var guild = await Discord.GetGuildAsync(channel.GuildId, innerCancellationToken);

DiscordChatExporter.Cli/Utils/Extensions/ConsoleExtensions.cs

@@ -44,6 +44,7 @@ internal static class ConsoleExtensions
         }
         finally
         {
+            progressTask.Value = progressTask.MaxValue;
             progressTask.StopTask();
         }
     }