backport: feat(vim.fs): vim.fs.root() can control priority #34413

feat(vim.fs): vim.fs.root() can control priority

Adds the capability of controlling the priority of searched markers in
vim.fs.root() by nesting lists.

(cherry picked from commit 0f0b96dd0f)

runtime/lua/vim/lsp.lua

@@ -708,13 +708,7 @@ function lsp.start(config, opts)
     validate('root_markers', opts._root_markers, 'table')
     config = vim.deepcopy(config)
 
-    for _, marker in ipairs(opts._root_markers) do
-      local root = vim.fs.root(bufnr, marker)
-      if root ~= nil then
-        config.root_dir = root
-        break
-      end
-    end
+    config.root_dir = vim.fs.root(bufnr, opts._root_markers)
   end
 
   if