some more changes from upstream

What does this PR do?

your weekly bunch of updates from upstream! remember that I'm trialing this future branch, into which I'll merge upstream changes relatively often, so we can review them in smaller chunks without risking our develop branch.

see also !465 (closed)

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requested review from @Leah, @luna, and @esm

changed title from chore(backend): validateNoteの結果Errorはそのままthrowする to some more changes from upstream

mentioned in merge request !479 (closed)

mentioned in merge request !491 (closed)

approved this merge request

mentioned in merge request !502 (closed)

closing and merging manually into future

closed