format: Re-implement support for formatting with code actions that contain commands (#28392)

Closes #27692
Closes #27935

Release Notes:

- Fixed a regression where code-actions used when formatting on save
were rejected if they contained commands

crates/project/src/buffer_store.rs

@@ -275,6 +275,7 @@ impl RemoteBufferStore {
                 if push_to_history {
                     buffer.update(cx, |buffer, _| {
                         buffer.push_transaction(transaction.clone(), Instant::now());
+                        buffer.finalize_last_transaction();
                     })?;
                 }
             }