"asdf list all python" returns no output when used with asdf v0.16.0

### Provide environment information

```bash
OS:
Linux workstation.domain.com 6.12.11-200.fc41.x86_64 #1 SMP PREEMPT_DYNAMIC Fri Jan 24 04:59:58 UTC 2025 x86_64 GNU/Linux

SHELL:
GNU bash, version 5.2.32(1)-release (x86_64-redhat-linux-gnu)
Copyright (C) 2022 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later

This is free software; you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

BASH VERSION:
5.2.32(1)-release

ASDF VERSION:
v0.16.0

ASDF INTERNAL VARIABLES:
ASDF_DEFAULT_TOOL_VERSIONS_FILENAME=.tool-versions
ASDF_DATA_DIR=/home/user/.asdf
ASDF_CONFIG_FILE=/home/user/.asdfrc

ASDF INSTALLED PLUGINS
python https://github.com/danhper/asdf-python.git a3a01856098d6d2b9642e382f5b38e70275726d1
```

### To Reproduce

1. Uninstall asdf v0.15
2. Migrate to asdf v0.16.0 by following the [Upgrading to 0.16.0 documentation](https://asdf-vm.com/guide/upgrading-to-v0-16.html)
3. Install the asdf python plugin
4. Run the command `asdf list all python`

### Describe the Bug

Running `asdf list all python` returns no output.

```bash
$ asdf list all python

$
```

### Expected Behaviour

Running "asdf list all python" should return the list of all python versions available for installation.

まず、asdf v0.16.0 にアップグレードした後、asdf-python プラグインと `asdf list all python` コマンドを使って報告された動作を再現します。このコマンドをプラグインがどのように処理しているかを追跡し、完成した変更によってインストール可能な Python バージョンが出力されることを確認します。

索引モデルが issue の本文から書いたものです。