Maybe unsilence "Why are errors silenced here?" errors

[pshaughn]

Numerous functions in script/dom queue a task and ignore the Result. Some of these already had a comment (mostly from @nox) asking why we were ignoring it. I tried unignoring them and adding .expect to them all in #25685 and nothing bad happened in CI (the one test failure is just an intermittent reftest of the #24726 variety).

1: Should we go ahead and merge?
2: Of the errors that didn't have that comment, are there any we already know we need to silence, or would it make sense to try unsilencing all of them?

[nox]

+1 on landing your PR. We shouldn't silence stuff when we don't know why we are silencing them in the first place.