api-version is not being passed in subclient accessors

[JoshLove-msft]

e.g. https://github.com/Azure/azure-sdk-for-net/pull/50622/files#diff-ad4fabdae846bb962b4af168c5fa4edc34c433398f30c220c7438f928aae310eR59

        /// <summary> Initializes a new instance of Evaluations. </summary>
        /// <param name="pipeline"> The HTTP pipeline for sending and receiving REST requests and responses. </param>
        /// <param name="endpoint"> Service endpoint. </param>
        /// <param name="apiVersion"></param>
        internal Evaluations(ClientPipeline pipeline, Uri endpoint, string apiVersion)
        {
            _endpoint = endpoint;
            Pipeline = pipeline;
            _apiVersion = apiVersion;
        }

[JoshLove-msft]

Looks like the root cause is the api-version field is not cached on the main client.