internal/setup: move sudo into SudoDevbox function + fix macOS CI

[gcurtis]

Move the code that calls sudo devbox into the setup package and clean it up a bit. Fix some issues that were preventing the cache from being configured in non-interactive environments (such as CI).

• Don't re-prompt the user for confirmation in the sudo process.
• Don't call NeedsRun a second time in the sudo process.
• Don't prompt the user when stdin isn't a tty. This fixes cache configuration on macOS in CI.
• Preserve Devbox environment variables such as DEVBOX_DEBUG, DEVBOX_API_TOKEN, DEVBOX_PROD, and DEVBOX_USE_VERSION. This addresses cases where the sudo devbox process would use the wrong auth or API endpoint.
• Combine the nixcache aws and nix setup tasks into one task. There was a lot of overlap and this simplifies the setup code.

Reran the cache-upload workflow against this branch and it looks like the macOS runner is able to use the cache now - https://github.com/jetify-com/devbox/actions/runs/9022662173/job/24792707507#step:5:828

[sentry-io[bot]]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ Generic Error: nixcache: run setup: setup: task : update nix config: don't know how to restart ... go.jetpack.io/devbox/internal/devbox/providers/... View Issue

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