Switch to poetry package manager

Contents (#2)

IMPORTANT: There is 1 breaking change.

Enhancements

• Switch to poetry for package management
• Update dockerfile with new base and installation instructions

Fixes

• Fix diagnostics_cloud_path key in octue.yaml

Operations

• Restrict CodeQL runs to pushes to main
• Use reusable workflow for semantic version check

Dependencies

• 💥 BREAKING CHANGE: Use latest octue branch

Testing

• Test service/app configuration in app test

Upgrade instructions

Use octue>=0.53.0 to interact with this service.