Azure MySQL single and flexible servers should have AAD authentication configured

[BenjaminEngeset]

Existing rule

No response

Suggested rule

AAD authentication improves security by ensuring that Azure MySQL flexible servers can be accessed by Azure Active Directory identities which are far more secure than local methods.

This is supported for both single and flexible servers deployment model.

Pillar

Security

Additional context

https://learn.microsoft.com/en-us/azure/mysql/single-server/concepts-azure-ad-authentication
https://learn.microsoft.com/en-us/azure/mysql/flexible-server/concepts-azure-ad-authentication
https://learn.microsoft.com/en-us/azure/templates/microsoft.dbformysql/servers/administrators
https://learn.microsoft.com/en-us/azure/templates/microsoft.dbformysql/flexibleservers/administrators

[BenjaminEngeset]

@BernieWhite I have messed up, I have attached the PostgreSQL rules that are in PR to these ones, so I'll create new to issues and reference them instead.