Only throw CliArgumentsException for pack command when help flags are present

Changed the condition in PackAction.ParseArgs() to only throw CliArgumentsException
when args contain --help, -h, or -? flags, instead of when no args are provided.
This ensures the help display behavior only triggers when explicitly requested.

Addresses feedback from @aishwaryabh in comment 2342407401.

Co-authored-by: aishwaryabh <37918412+aishwaryabh@users.noreply.github.com>

Author: Copilot

src/Cli/func/Actions/LocalActions/PackAction/PackAction.cs

@@ -1,6 +1,7 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the MIT License. See LICENSE in the project root for license information.
 
+using System;
 using Azure.Functions.Cli.Common;
 using Azure.Functions.Cli.Helpers;
 using Azure.Functions.Cli.Interfaces;
@@ -47,8 +48,13 @@ public override ICommandLineParserResult ParseArgs(string[] args)
 
             var parseResult = base.ParseArgs(args);
 
-            // For help display, throw CliArgumentsException to show positional arguments when no args provided
-            if (!args.Any())
+            // For help display, throw CliArgumentsException to show positional arguments when help is requested
+            var helpArgs = new[] { "help", "h", "?" };
+            var containsHelpFlag = args.Any(arg => 
+                helpArgs.Any(ha => arg.Equals($"-{ha}", StringComparison.OrdinalIgnoreCase) || 
+                                   arg.Equals($"--{ha}", StringComparison.OrdinalIgnoreCase)));
+
+            if (containsHelpFlag)
             {
                 throw new CliArgumentsException(
                     "Pack function app arguments.",