feat(copilot-chat): remove call to nvim-cmp integration (#4822)

nvim-cmp integration was removed in favour of custom autocomplete (it
was pointless trying to support all the new completion plugins when its
15 lines to implement something plugin specific)

Signed-off-by: Tomas Slusny <slusnucky@gmail.com>

lua/lazyvim/plugins/extras/ai/copilot-chat.lua

@@ -66,9 +66,6 @@ return {
     },
     config = function(_, opts)
       local chat = require("CopilotChat")
-      if pcall(require, "cmp") then
-        require("CopilotChat.integrations.cmp").setup()
-      end
 
       vim.api.nvim_create_autocmd("BufEnter", {
         pattern = "copilot-chat",