Add lro enum

[m-nash]

Contributing to the Azure SDK

Adding a new LRO enum to indicate if the method should wait for full completion or return after it has started.

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[azure-sdk]

API changes have been detected in Azure.Core. You can review API changes here

API changes

+     public enum WaitUntil {
+         Completed = 0,
+         Started = 1,
+     }

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[annelo-msft]

We should add tests to illustrate the intended usage of this type.

Are updates needed to any of the Operation* types to enforce usage of this type, or is there an issue tracking that work?

[m-nash]

We should add tests to illustrate the intended usage of this type.

Are updates needed to any of the Operation* types to enforce usage of this type, or is there an issue tracking that work?

No real way to enforce this, you can easily use an Operation object as a return for a method that does not have this parameter. This would be the new standard going forward for LRO methods however which are initially being enforced only in generated clients like LLC and Mgmt

[annelo-msft]

Looks like we have this issue tracking the work I mentioned - I just added the Azure.Core label so it doesn't get lost.

#25716