chore(features) rm Feature::ApplyPatchFreeform (#22711)

## Summary
Removes the feature since this is effectively on by default in all cases
where we should use it, or can be configured via models.json.

## Testing
- [x] unit tests pass

codex-rs/thread-manager-sample/src/main.rs

@@ -262,7 +262,6 @@ fn new_config(model: Option<String>, arg0_paths: Arg0DispatchPaths) -> anyhow::R
         experimental_thread_store: ThreadStoreConfig::Local,
         forced_chatgpt_workspace_id: None,
         forced_login_method: None,
-        include_apply_patch_tool: false,
         web_search_mode: Constrained::allow_any(WebSearchMode::Disabled),
         web_search_config: None,
         use_experimental_unified_exec_tool: false,