Migrate to Pydantic V2 for the CDK Manifest Models

[natikgadzhi]

I was tinkering around and noticed that we have this beauty of a script that makes sure that generating Python models from YAML component schema runs in Dagger of all things, because we want the OS-level dependency pinning for datamodel-codegen.

This is insane to me. We are using crazy shenanigans to avoid updating to a modern library.

We should either update to Pydantic V2 and have a normal Python or a Bash script to generate the models, or we should switch to @dataclass entirely (if we are not actively using validations).

I think @tolik0's work around refactoring the model to component factory is relevant here — it could be that this is predecessor, or vice versa.