Add a CI check for todo! and FIXME comments (#21950)

Motivation for this is to support writing comments that will certainly
be revisited before merge.

Release Notes:

- N/A

crates/project/src/buffer_store.rs

@@ -1668,7 +1668,7 @@ impl BufferStore {
                         .log_err();
                 }
 
-                // todo!(max): do something
+                // TODO(max): do something
                 // client
                 //     .send(proto::UpdateStagedText {
                 //         project_id,