Cleanup functions that access ETS tables may fail with `badarg` error during EMQX shutdown.
They are called asynchronously by `emqx_pool` workers and accessed ETS tables
may be already destroyed as their owners are shut down.
This fix catches ETS `badarg` errors before they can be caught and logged by `emqx_pool`.
Fixes: EMQX-9992
Serge Tupchii