Duo Agents Platform - Add flowSessionEvents field to get a flow events

Currently we have the duoWorkflowEvents field to get all of the events based on a flow ID. But this is scoped to a user, so we need a new field flowSessionEvents that takes a flow ID and then returns all of the event. This is project scoped for now with possibly in the future to reuse this for group/instance scope.

query getFlowSessionEvents($workflowId: AiDuoWorkflowsWorkflowID!, $projectPath: ID!){
  project(fullPath: $projectPath){
    flowSessionEvents(flowId: $workflowId){
      nodes {
        checkpoint
        errors
        flowPrompt # Equals workflowGoal
        flowStatus # Equals workflowStatus
        flowDefinition # Equals workflowDefinition
      }
    }
  }
}