agent2: Port edit_file tool (#35844)

TODO:
- [x] Authorization
- [x] Restore tests

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>
Co-authored-by: Ben Brandt <benjamin.j.brandt@gmail.com>

crates/assistant_tools/src/edit_agent.rs

@@ -29,7 +29,6 @@ use serde::{Deserialize, Serialize};
 use std::{cmp, iter, mem, ops::Range, path::PathBuf, pin::Pin, sync::Arc, task::Poll};
 use streaming_diff::{CharOperation, StreamingDiff};
 use streaming_fuzzy_matcher::StreamingFuzzyMatcher;
-use util::debug_panic;
 
 #[derive(Serialize)]
 struct CreateFilePromptTemplate {
@@ -682,11 +681,6 @@ impl EditAgent {
                 if last_message.content.is_empty() {
                     conversation.messages.pop();
                 }
-            } else {
-                debug_panic!(
-                    "Last message must be an Assistant tool calling! Got {:?}",
-                    last_message.content
-                );
             }
         }