Unattended doom upgrade seemingly impossible

### What did you expect to happen?

printf 'n\ny\n' | doom upgrade

Confirms the prompts, or there is some other way (such as the previous `--yes`, see https://github.com/doomemacs/doomemacs/issues/4181)

Probably related to https://github.com/doomemacs/doomemacs/issues/4273

### What actually happened?

It still prompts about viewing diffs - why is viewing diffs even so important?
I know no other project that nags about this when upgrading, except maybe `yay` with AUR packages, where caution is actually necessary.

### Describe your attempts to resolve the issue

Mimick `doom upgrade` with an alias that works silently

### Steps to reproduce

printf 'n\ny\n' | doom upgrade

### System Information

doesn't matter