[release/9.1] Don't set properties on existing Azure SQL server resources #7707
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Backport of #7705 to release/9.1
/cc @captainsafia
Customer Impact
This PR updates the bicep generated for existing Azure SQL resources to avoid mutating properties on existing resources. It uses a workaround to model the administrator access for the managed identity as an "edge" between the parent SqlServer resource and a custom SqlServerAzureADAdministrator resource.
Without this change, the generated Bicep is invalid and will fail to provision the resource correctly.
Testing
Risk
Low, affects Azure SQL services only and avoid errors during provisioning with current implemenation.
Regression?
No.