agent: Remove edit_files tool (#28041)

Release Notes:

- agent: Remove `edit_files` tool  in favor of `find_replace`

Cargo.lock

@@ -738,7 +738,6 @@ dependencies = [
  "assistant_tool",
  "chrono",
  "collections",
- "feature_flags",
  "futures 0.3.31",
  "gpui",
  "html_to_markdown",
@@ -746,18 +745,14 @@ dependencies = [
  "itertools 0.14.0",
  "language",
  "language_model",
- "log",
  "lsp",
  "open",
  "project",
  "rand 0.8.5",
  "regex",
- "release_channel",
  "schemars",
  "serde",
  "serde_json",
- "settings",
- "theme",
  "ui",
  "unindent",
  "util",