Rollup merge of #145815 - jieyouxu:pr-check-timeout, r=marcoieni

Wait for DPkg frontend lock when trying to remove packages

Hopefully this helps with [#t-infra > pr-check-1 fails on "free up disk space"](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/pr-check-1.20fails.20on.20.22free.20up.20disk.20space.22/with/535794424).

As suggested by riking in [#t-infra > pr-check-1 fails on "free up disk space" @ 💬](https://rust-lang.zulipchat.com/#narrow/channel/242791-t-infra/topic/pr-check-1.20fails.20on.20.22free.20up.20disk.20space.22/near/535791579), thanks!

r? infra-ci

Author: Zalathar