CHEF-19255 Fix named pipes to be more secure

[sa-progress]

Description

This PR implements security best practices for Windows named pipe usage in the local transport.

• Randomizes pipe names
• Sets strict ACLs on named pipes
• Verifies pipe ownership before connecting
• Ensures fully qualified paths are used for PowerShell execution

Related Issue

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New content (non-breaking change)
• [ ] Breaking change (a content change which would break existing functionality or processes)

Checklist

• [x] I have read the CONTRIBUTING document.