REMOVE_CHMOD is necessary to remove files/dirs that are owned by us but have an access mode that would not allow us to remove them. In generic destructor calls for use with `_cleanup_` that are "fire-and-forget" style we should make use of that, to maximize the chance we can actually remove the files/dirs. (Also, add in REMOVE_MISSING_OK. Just because prettier, we ignore the return codes anyway, but it' a bit nicer to ignore a bit fewer errors.)
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