AutoHelp and AutoVersion don't work when the arguments contain executable name

`Environment.GetCommandLineArgs()` returns arguments including the program path (but not including `dotnet`):
```cs
{ "/Users/usrsse2/project/CLI/bin/Debug/net6.0/CLI.dll", "--version" }
```
When I pass it into `ParseArguments`, it correctly parses all options and values defined in my T, but for `--help` and `--version` returns `UnknownOptionError` instead of the expected `HelpRequestedError` and `VersionRequestedError`. When I pass `Environment.GetCommandLineArgs().Skip(1)`, it works correctly.

This is probably related to #600, because `--help` is recognized only if it's the first option.

將 Environment.GetCommandLineArgs() 傳遞給 ParseArguments 來重現問題，然後與 Skip(1) 的情況進行比較，並檢視 #600 所參照的行為。即使可執行檔路徑是第一個引數，--help 和 --version 仍會產生 HelpRequestedError 和 VersionRequestedError，即表示工作完成。

由索引模型根據 Issue 內容生成。