internal/nix: fix unredacted error message

[gcurtis]

Don't pass a slice of already-redacted arguments to redact.Errorf so that they're preserved in the regular error message.

Tested by forcing an error and seeing the full message:

$ go run ./cmd/devbox shell
Ensuring packages are installed.
✓ Computed the Devbox environment.
Error: nix print-dev-env --json "path:/Users/gcurtis/src/devbox/.devbox/gen/flake": exit status 1

Error: There was an internal error. Run with DEVBOX_DEBUG=1 for a detailed error message, and consider reporting it at https://github.com/jetpack-io/devbox/issues

Gets redacted in Sentry as:

nix print-dev-env --json "path:<redacted string>": <redacted *exec.ExitError>

[savil]

Tested and verified that the error motivated #1778 is properly handled as well. Thanks!

[savil]

Rebased to incorporate the CICD fix of #1786

[sentry-io]

Suspect Issues

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

• ‼️ **exec.ExitError: <redacted errors.withStack>: nix print-dev-env --json "path:": <redacted exec.... go.jetpack.io/devbox/internal/nix in (*Nix).Pri... View Issue
• ‼️ *exec.ExitError: nix print-dev-env --json "path:": <redacted exec.ExitError> go.jetpack.io/devbox/internal/nix in (*Nix).Pri... View Issue
• ‼️ **exec.ExitError: <redacted usererr.combined>: nix print-dev-env --json "path:": <redacted exec.... go.jetpack.io/devbox/internal/nix in (*Nix).Pri... View Issue
• ‼️ **exec.ExitError: <redacted errors.withStack>: nix print-dev-env --json "path:": <redacted exec.... go.jetpack.io/devbox/internal/nix in (*Nix).Pri... View Issue

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