Add option to skip the upgrade exclusion prompt

[fzlzjerry]

Fixes #2814.

Summary

• add a noupgrademenu JSON/CLI option and no_upgrade_menu Lua option
• keep listing available upgrades while accepting the remaining packages without reading stdin
• preserve UpgradeSelect hook exclusions and keep the prompt enabled by default
• document the option and expose it in Bash, Fish, and Zsh completions

Testing

• make test
• GOFLAGS="-buildvcs=false -tags=next" /app/bin/golangci-lint run ./...
• bash -n completions/bash

Tests were run in ghcr.io/jguer/yay-builder:latest, matching the repository's Arch/libalpm CI environment.

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