Fix missing dedupe states for gRPC client server impl

[jviau]

Fixes missing dedupe states in the gRPC server client when scheduling a new orchestration via IOrchestrationServiceClient. Without the dedupe states, we would effectively restart already running orchestrations when it was scheduled again.

Issue describing the changes in this PR

resolves #2466

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[cgillum]

I'm confused. The method name is GetStatusesNotToOverride, but the value we're returning seems to be the opposite of this: overridableStates. Why is this logic correct? Assuming it is correct, can we rename something to make it obviously correct?

[jviau]

It is a bit confusing, but it is public API so no changing it unfortunately. I think it becomes a bit clearer when you read the values of OverridableStates. AnyStates and NonRunningStates. So, it is kind of a double negative. Don't think I can change it in this PR.

    /// <summary>
    /// Represents options for different states that an existing orchestrator can be in to be able to be overwritten by
    /// an attempt to start a new instance with the same instance Id.
    /// </summary>
    public enum OverridableStates
    {
        /// <summary>
        /// Option to start a new orchestrator instance with an existing instnace Id when the existing
        /// instance is in any state.
        /// </summary>
        AnyState,

        /// <summary>
        /// Option to only start a new orchestrator instance with an existing instance Id when the existing
        /// instance is in a terminated, failed, or completed state.
        /// </summary>
        NonRunningStates,
    }

[cgillum]

I think this Java issue will get resolved by this PR as well: microsoft/durabletask-java#135