Tests that Preload.prerenderStatusUpdated is sent for speculation rule with "prerender_until_script" action.
{
    method : Preload.prerenderStatusUpdated
    params : {
        key : {
            action : PrerenderUntilScript
            loaderId : <string>
            url : http://127.0.0.1:8000/inspector-protocol/prerender/resources/prerender.html
        }
        pipelineId : <string>
        status : Pending
    }
    sessionId : <string>
}
{
    method : Preload.prerenderStatusUpdated
    params : {
        key : {
            action : PrerenderUntilScript
            loaderId : <string>
            url : http://127.0.0.1:8000/inspector-protocol/prerender/resources/prerender.html
        }
        pipelineId : <string>
        status : Running
    }
    sessionId : <string>
}