Assign a stable identity to Worktree entries

Co-Authored-By: Nathan Sobo <nathan@zed.dev>

zed/src/worktree/fuzzy.rs

@@ -618,8 +618,10 @@ mod tests {
                 abs_path: PathBuf::new().into(),
                 ignores: Default::default(),
                 entries: Default::default(),
+                removed_entry_ids: Default::default(),
                 root_name: Default::default(),
                 root_char_bag: Default::default(),
+                next_entry_id: Default::default(),
             },
             false,
             path_entries.into_iter(),