`2>/dev/null` still requires permission

[eihigh]

Describe the bug

Issue #211 is still bothering me even in v1.0.25. Copilot tried to run a harmless command like this via the shell tool, but as you can see it still asks for permission:

◐ The user is asking about the "XXX" command. Let me look at the repository structure to understand what this command does.

● List directory .
  └ 30 files found

● View XXX command script (shell)
  └ cat /Users/XXX/XXX/XXX 2>/dev/null | head -80

╭───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮
│ View XXX command script                                                                                                                                             │
│ ───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────── │
│ ╭───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╮ │
│ │ cat /Users/XXX/XXX/XXX 2>/dev/null | head -80                                                                                        │ │
│ ╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────╯ │
│                                                                                                                                                                       │
│ Do you want to run this command?                                                                                                                                      │
│                                                                                                                                                                       │
│ ❯ 1. Yes                                                                                                                                                              │
│   2. No, and tell Copilot what to do differently (Esc to stop)                                                                                                        │
│                                                                                                                                                                       │
│ ↑↓ to navigate · Enter to select · Esc to cancel                                                                                                                      │
╰───────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────

Affected version

GitHub Copilot CLI 1.0.25.

Steps to reproduce the behavior

1. Run Copilot.
2. Ask it to explore some code.
3. Occasionally, Copilot will try to execute a shell command that includes an stderr redirect to /dev/null.
4. It will prompt for permission.

Expected behavior

Copilot does not ask for permission

Additional context

macOS, zsh