Use custom devcontainer images with unexpected python instalations

The uv setup relies on the standard devcontainer image which comes with the repo. If attempting to switch image, the default uv integration fails.

Resolved by clearing existing uv setup and installing fresh, then using `$ uv venv --seed --system-site-packages` to create the venv. Run programs with `$ uv run python /workspaces/path_to_file/file.py`.