function agentPolicy(agent) {
    return {
        name: exports.agentPolicyName,
        sendRequest: async (req, next) => {
            // Users may define an agent on the request, honor it over the client level one
            if (!req.agent) {
                req.agent = agent;
            }
            return next(req);
        },
    };
}
Gets a pipeline policy that adds API key authentication to requests