Added unstructured host to worker vscode launch config

[jamesrichards4]

Context

Developers should be able to use vscode launch to start core-api and worker, currently the worker uses the wrong hostname for unstructured

Changes proposed in this pull request

Add UNSTRUCTURED_HOST to the list of overrides in vscode launch. These are set here to avoid having to set them in .env which has the correct values for docker-compose

Things to check

• [ ] I have added any new ENV vars in all deployed environments
• [ ] I have tested any code added or changed
• [ ] I have run integration tests