chore(#3196): remove unused utils.read_file

lua/nvim-tree/utils.lua

@@ -17,22 +17,6 @@ function M.str_find(haystack, needle)
   return vim.fn.stridx(haystack, needle) ~= -1
 end
 
----@param path string
----@return string|uv.uv_fs_t
-function M.read_file(path)
-  local fd = vim.loop.fs_open(path, "r", 438)
-  if not fd then
-    return ""
-  end
-  local stat = vim.loop.fs_fstat(fd)
-  if not stat then
-    return ""
-  end
-  local data = vim.loop.fs_read(fd, stat.size, 0)
-  vim.loop.fs_close(fd)
-  return data or ""
-end
-
 local path_separator = package.config:sub(1, 1)
 ---@param paths string[]
 ---@return string