`azd tool list` fails to detect installed `azd-ai-extensions`

[Menghua1]

Description:
Running azd tool list shows azd-ai-extensions as Not Installed, even though AI-related azd extensions are already installed locally and shown by azd ext list.

In addition, azd tool install azd-ai-extensions fails with: azd AI Extensions was installed but verification failed.

Steps to Reproduce:

1. Install the latest daily version of azd.
2. Run azd config set alpha.tool on.
3. Run azd tool list.
4. Run azd ext list.
5. Run azd tool install azd-ai-extensions.

Environment:

• Azd version: azd version 1.26.0-beta.1-daily.6280267 (commit 0632821) (daily).
• OS: Windows, Linux and Mac.

Expected Behavior:

• azd tool list should accurately reflect the installed state of azd-ai-extensions
• azd tool install azd-ai-extensions should either detect that it is already satisfied or install successfully without verification failure

@rajeshkamal5050 and @wbreza for notification.

[Menghua1]

@rajeshkamal5050, @wbreza and @hemarina Retested based on PR #8194, this issue can no longer be reproduced, so it will be closed.