add UniqueIdentifiers utility function to Domain, Service, and Team

[davidbloss]

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Changelog

Add UniqueIdentifiers() to Domain, Service, and Team structs. This returns a slice of strings with Aliases not found in ManagedAliases. These unique identifiers are what are used in URLs and are managed by OpsLevel and not the customer. Being able to isolate these will help manage aliases that customers can update.

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