feat(backend): flow streaming (#6520)

* feat(backend): flow streaming

* all streaming languages + sync api

* sqlx

* fix build

* UI and nits

* nit

* feat: stream last flow step

* sqlx

* nit

* use get for stream endpoints + add snippet in UI

* refactor

* nits

* Update backend/windmill-worker/src/common.rs

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

* nits

---------

Co-authored-by: graphite-app[bot] <96075541+graphite-app[bot]@users.noreply.github.com>

backend/windmill-worker/src/java_executor.rs

@@ -534,6 +534,7 @@ async fn compile<'a>(
             false,
             &mut Some(occupancy_metrics),
             None,
+            None,
         )
         .await?;
 
@@ -718,6 +719,7 @@ async fn run<'a>(
         false,
         &mut Some(occupancy_metrics),
         None,
+        None,
     )
     .await?;
     Ok(())