Update devcontainer to Dotnet 8

[NickHirras]

Pull Request

📖 Description

The devcontainer definition in this project was from Dotnet 6 and no longer usable. This PR updates to the new format and updates to Dotnet 8.

🎫 Issues

👩‍💻 Reviewer Notes

This is for the VSCode devcontainer feature.

📑 Test Plan

✅ Checklist

General

• I have added tests for my changes.
• I have tested my changes.
• I have updated the project documentation to reflect my changes.
• I have read the CONTRIBUTING documentation and followed the standards for this project.

Component-specific

• I have added a new component
• I have added Unit Tests for my new compontent
• I have modified an existing component
• I have validate Unit Tests for an existing component

⏭ Next Steps