Azure Spring Apps should be removed from Azure Toolkit Tutorial

When installing the Azure Toolkit or opening the tutorials directly, developers get a list of awesome tutorials.

Azure Spring Apps is a deprecated service and should not be one of them

<img width="1361" height="757" alt="Image" src="https://github.com/user-attachments/assets/3b3a0b92-7dec-4df8-b6d8-4a36d8c57e78" />