fix(pick): remove the unused commands attribute (#3673)

## What is this PR for?
When we register a picker, such as a Telescope picker or a fzf-lua
picker,

we use commands within their own picker. For example, we use
M.picker.commands instead of M.pick.commands.

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  why we should accept this pull request. -->

## Does this PR fix an existing issue?
no

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## Checklist

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

lua/lazyvim/util/pick.lua

@@ -20,11 +20,6 @@ local M = setmetatable({}, {
 ---@type LazyPicker?
 M.picker = nil
 
----@type table<string, string>
-M.commands = {
-  files = "find_files",
-}
-
 ---@param picker LazyPicker
 function M.register(picker)
   -- this only happens when using :LazyExtras