feat(refactoring): fallback to using vim ui select for refactoring.nvim (#5540)

## Description

Fallback to using `require("refactoring").select_refactor()` if neither
of `telescope` or `fzf-lua` is installed. Since `select_refactor()` uses
`vim.ui.select` internally, it can use `snacks.picker` if it is enabled.
## Related Issue(s)

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  If this PR fixes any issues, please link to the issue here.
  - Fixes #<issue_number>
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## Screenshots

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## Checklist

- [ x] I've read the
[CONTRIBUTING](https://github.com/LazyVim/LazyVim/blob/main/CONTRIBUTING.md)
guidelines.

lua/lazyvim/plugins/extras/editor/refactoring.lua

@@ -1,10 +1,10 @@
 local pick = function()
+  local refactoring = require("refactoring")
   if LazyVim.pick.picker.name == "telescope" then
     return require("telescope").extensions.refactoring.refactors()
   elseif LazyVim.pick.picker.name == "fzf" then
     local fzf_lua = require("fzf-lua")
-    local results = require("refactoring").get_refactors()
-    local refactoring = require("refactoring")
+    local results = refactoring.get_refactors()
 
     local opts = {
       fzf_opts = {},
@@ -16,6 +16,8 @@ local pick = function()
       },
     }
     fzf_lua.fzf_exec(results, opts)
+  else
+    refactoring.select_refactor()
   end
 end