Enable version control management in VS Code

[MBARIMike]

The smdb/ directory is currently mounted in the django container as /app. The .git folder is in the parent directory not giving VS Code visibility into the Git repo. Change how debug.yml and devcontainer.json works to have VS Code use the parent directory.

[MBARIMike]

Source Control from VS Code works now on my machine! The debug.yml needs to be edited on your machine to so that your ~/.ssh folder is available in the development container.

[MBARIMike]

Well, Source Control now works from VS Code, but the changes appear to have broken Testing in VS Code. It's likely a recognized bug in VS Code. On balance it's better to have Source Control as testing can still happen at the command line and in CI. Hoping for a bug fix soon for microsoft/vscode-python#16936.