Rollup merge of #117074 - ouz-a:remove_smir, r=compiler-errors

Remove smir from triage and add me to stablemir

As we discussed this in [weekly ](https://rust-lang.zulipchat.com/#narrow/stream/320896-project-stable-mir/topic/.5Bbi-weekly.5D.202023-10-20)meeting we don't really care for changes that happens in `smir`, we only care about changes that happen to `stable_mir` so I removed smir triage ping and added myself to `stable_mir` ping list

Author: matthiaskrgr