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/editor/src/editor.rs

@@ -4272,6 +4272,7 @@ impl Editor {
                     buffer
                         .update(cx, |buffer, _| {
                             buffer.push_transaction(transaction, Instant::now());
+                            buffer.finalize_last_transaction();
                         })
                         .ok();
                 }