[Azure Spring Cloud]Enable Application Insights and log analytics for Azure Spring Cloud in PowerShell

## Description of the new feature
Enable Application Insights and log analytics for Azure Spring Cloud in PowerShell

1. Go to your Azure Spring Cloud service page in the Azure portal.
2. On the Monitoring page, select Distributed Tracing.
3. Select Edit setting to edit or add a new setting.
4. Create a new Application Insights query, or select an existing one.
5. Choose which logging category you want to monitor, and specify the retention time in days.
6. Select Apply to apply the new tracing.

How this enabling of app insights can be automated (e.g. with Powershell or terraform)?
Same for Log analytics.

Submit it on behalf of top customers.

## Proposed implementation details (optional)

Begin with the Azure portal's Monitoring > Distributed Tracing flow described in the issue, then compare how Azure PowerShell and Terraform could automate Application Insights and Log Analytics settings. Done means a concrete, supported automation path is defined for both services, with its scope and validation documented.

Written by the indexing model from the issue text.