Add CI check that cmd- is not in linux keymaps + check other mods (#32334)

Motivation for the `cmd-` check is that there were a couple keybindings
using `cmd-` in the linux keymap and so these were bound to super /
windows

Release Notes:

- N/A

script/check-todos

@@ -8,7 +8,7 @@ result=$(git grep --no-color --ignore-case --line-number --extended-regexp -e $p
   ':(exclude).github/workflows/ci.yml' \
   ':(exclude)*criteria.md' \
   ':(exclude)*prompt.md' || true)
-echo "${result}"
 if [[ -n "${result}" ]]; then
+  echo "${result}"
   exit 1
 fi