Parity Update to match Unity Builder v4

What's Changed

• [BREAKING] Updated activation strategy to align with builder strategy for more stable activation with retry logic. UNITY_EMAIL and UNITY_PASSWORD are now required
• Added containerRegistryImageVersion and containerRegistryRepository for improved custom image support
• Added runAsHostUser to fix self-hosted runner issues
• Added error/warning annotations for activation issues
• Improved serial masking
• Fix workspace path for Windows runners (Credit @asyasmi)
• Update to node20

Full Changelog: v4...v4.1.0