When I request cost recommendations on VM right-sizing using get-azadvisorrecommendation no savings values are returned

When using the Azure portal, VM Right-sizing advice shows the potential savings for each recommendation. However, requesting the same data using the Powershell cmdlet doesn't show annual savings potential amounts. there is the extendedProperties object, but that only shows the machine resize details, not the cost savings.

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* ID: 63717818-fb94-62bf-b968-79cc2aa2d3a9
* Version Independent ID: 4676b8b1-2ef3-762c-c8c1-7a882428d54e
* Content: [Get-AzAdvisorRecommendation (Az.Advisor)](https://docs.microsoft.com/en-us/powershell/module/az.advisor/get-azadvisorrecommendation?view=azps-6.4.0)
* Content Source: [src/Advisor/Advisor/help/Get-AzAdvisorRecommendation.md](https://github.com/Azure/azure-powershell/blob/main/src/Advisor/Advisor/help/Get-AzAdvisorRecommendation.md)
* Service: **azure-powershell**
* GitHub Login: @dcaro
* Microsoft Alias: **dcaro**

Start with src/Advisor/Advisor/help/Get-AzAdvisorRecommendation.md and reproduce the VM right-sizing query described in the issue. Compare the cmdlet response, including extendedProperties, with the Azure portal's savings information and trace whether the missing annual savings come from the cmdlet or its service response. Done means the savings values are returned or the limitation is clearly documented.

Written by the indexing model from the issue text.