feat(propdefs-v2): inline batch writes when any batch bucket is full (#30959)

Author: eli-r-ph

rust/property-defs-rs/src/v2_batch_ingestion.rs

@@ -306,6 +306,27 @@ pub async fn process_batch_v2(
                 }
             }
         }
+
+        // if any of the batches are full, execute them now
+        if handles.is_empty() {
+            continue;
+        }
+        let to_exec = handles;
+        handles = vec![];
+        for handle in to_exec {
+            match handle.await {
+                // metrics are statted in write_*_batch methods so we just log here
+                Ok(result) => match result {
+                    Ok(_) => continue,
+                    Err(db_err) => {
+                        error!("Batch write exhausted retries: {:?}", db_err);
+                    }
+                },
+                Err(join_err) => {
+                    warn!("Batch query JoinError: {:?}", join_err);
+                }
+            }
+        }
     }
 
     // ensure partial batches are flushed to Postgres too