Roll out Tailscale as a standalone macOS app

Tailscale, a VPN service, now offers a standalone macOS application starting with version 1.26, enabling easier deployment in work environments where not everyone may have an Apple ID, particularly through mobile device management (MDM) solutions. This standalone version maintains the same functionality as the App Store version and is compatible with macOS's two primary methods for managing VPNs: the Network Extension and generic system extensions. While Network Extension is typically used for sandbox applications via the App Store, generic system extensions are employed for applications outside the App Store. Tailscale effectively supports both methods, allowing flexibility in how it operates on macOS devices.