Update AutoRest C# version

[azure-sdk]

Update AutoRest C# version to 3.0.0-beta.20210616.1

[pakrym]

cc @ellismg

You might need to react to public API changes by updating API listings.

[ellismg]

Looks like some of the generated code in the WPS was hand edited (to work around another generator issue), so I will need to address that.

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