feat(backend): job result stream optimization (#6673)

* feat(backend): job result stream optimization

* get offset locally instead of from db

* fix: agent worker result stream

* update ref

* nit

* remove foreign key on job

* fix build

backend/windmill-worker/src/python_executor.rs

@@ -544,6 +544,7 @@ pub async fn handle_python_job(
     new_args: &mut Option<HashMap<String, Box<RawValue>>>,
     occupancy_metrics: &mut OccupancyMetrics,
     precomputed_agent_info: Option<PrecomputedAgentInfo>,
+    has_stream: &mut bool,
 ) -> windmill_common::error::Result<Box<RawValue>> {
     let script_path = crate::common::use_flow_root_path(job.runnable_path());
 
@@ -885,6 +886,8 @@ mount {{
     )
     .await?;
 
+    *has_stream = handle_result.result_stream.is_some();
+
     if apply_preprocessor {
         let args = read_file(&format!("{job_dir}/args.json"))
             .await