Leverage Conan for build order determination

Use:

```
conan graph build-order --format=json
```

to determine the correct build order instead of having to maintain hard coded "build levels" in versions.yaml

Start by locating the hard-coded build levels in versions.yaml and trace where those levels determine the build order. Run `conan graph build-order --format=json` for the project graph and compare its result with the current order. Done means the Conan-generated order is used and the manually maintained build levels are no longer required.

Written by the indexing model from the issue text.