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>

Cargo.lock

@@ -158,8 +158,10 @@ dependencies = [
  "acp_thread",
  "agent-client-protocol",
  "agent_servers",
+ "agent_settings",
  "anyhow",
  "assistant_tool",
+ "assistant_tools",
  "client",
  "clock",
  "cloud_llm_client",
@@ -177,6 +179,8 @@ dependencies = [
  "language_model",
  "language_models",
  "log",
+ "lsp",
+ "paths",
  "pretty_assertions",
  "project",
  "prompt_store",