[Container Registry] Acr enums

[seankane-msft]

Dependent on #18397

[seankane-msft]

Dependent on #18392

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[kristapratico]

You should be able to do ArtifactArchitecture(self.architecture) if you want to convert the string to the enum type. Is this an input or result model? I feel like python users prefer to work with strings but ignore me if this design decision was already made.

[seankane-msft]

This is a result model. The ArtifactArchitecture inherits from str and Enum, users should be able to work with strings with this model.

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