injection fix using shell=false and directly passing args

[ayushhgarg-work]

Description

What

Fix command injection vulnerability (CWE-94) in commandline_utility.py by removing
unsafe shell=True + string-join pattern.

Related: MSRC Case 106104 (Moderate - Remote Code Execution)

Why

The run_cli_command function previously joined command arguments into a single string
via " ".join(cmd_arguments) and executed it with subprocess.check_output(..., shell=True).
This allowed shell metacharacters in user-controlled input (e.g., scoring_script path
in a deployment YAML) to break out of the command and execute arbitrary code.

Changes

• Linux/macOS: Use shell=False with argv list — shell metacharacters are never interpreted
• Windows: Use subprocess.list2cmdline() for safe quoting before shell execution,
  since many CLI tools (e.g., code) are .cmd/.bat shims that require shell execution
• Removed outdated comment and dead code referencing the old shell=True + join approach
• Added unit tests for run_cli_command covering:
  • Correct subprocess argument forwarding (shell, stderr, env)
  • Shell metacharacter injection prevention
  • JSON parsing and error propagation

Testing

• Verified on Windows that malicious arguments containing &, ;, | are safely quoted
  and do not result in command injection
• Unit tests pass on Windows

[Copilot]

Pull request overview

This PR updates the local endpoints CLI helper to mitigate command-injection risk by avoiding shell=True and executing subprocesses via an argv list.

Changes:

• Switch run_cli_command from shell=True + joined string commands to shell=False + argv list execution.
• Update CLI command logging to print a joined representation of argv instead of the prior command_to_execute string.

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