chore(copilot): add filetypes configuration

Added filetypes configuration to copilot plugin.

lua/custom/plugins/copilot.lua

@@ -17,5 +17,10 @@ return {
       replace_keycodes = false,
     })
     vim.g.copilot_no_tab_map = true
+    vim.g.copilot_filetypes = {
+      gitcommit = true,
+      markdown = true,
+      xml = false,
+    }
   end,
 }