[CLN] Cleanup query node after pushdown (#3280)

## Description of changes

*Summarize the changes made by this PR.*
 - Improvements & Bug fixes
   - Remove unused impls in query node after query pushdown landed
 - New functionality
   - N/A

## Test plan
*How are these changes tested?*

- [x] Tests pass locally with `pytest` for python, `yarn test` for js, `cargo test` for rust

## Documentation Changes
*Are all docstrings for user-facing APIs updated if required? Do we need to make documentation changes in the [docs repository](https://github.com/chroma-core/docs)?*
N/A

rust/worker/src/execution/operator.rs

@@ -73,6 +73,7 @@ impl<Output, Error> TaskResult<Output, Error> {
         self.result
     }
 
+    #[allow(dead_code)]
     pub(super) fn id(&self) -> Uuid {
         self.task_id
     }
@@ -101,6 +102,7 @@ pub(crate) type TaskMessage = Box<dyn TaskWrapper>;
 pub(crate) trait TaskWrapper: Send + Debug {
     fn get_name(&self) -> &'static str;
     async fn run(&self);
+    #[allow(dead_code)]
     fn id(&self) -> Uuid;
     fn get_type(&self) -> OperatorType;
 }