Fixed Set-AzWebApp and Set-AZWebAppSlot to rethrow exception when Service Principal/User doesn't have permission to list web app configuration. [#19942]

[rachelxj-ms]

Description

Fixed Set-AzWebApp and Set-AZWebAppSlot to rethrow exception when Service Principal/User doesn't have permission to list web app configuration. [#19942]

In order to update webapp configuration, there are 2 permissions that are required.
"Microsoft.Web/sites/config/write",
"Microsoft.Web/sites/config/list/Action"

When user doesn't have "Microsoft.Web/sites/config/list/Action", Set-AzWebApp and Set-AZWebAppSlot will wipe AppSettings without any error.

The fix will rethrow the exception when it's to update configuration. Get-AzWebApp is left as it being.

The error message will show as below:

Checklist

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[BethanyZhou]

Looks good to me

[BethanyZhou]

/azp run azure-powershell - security-tools

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