Validate that generated code matches included schemas

[james-garner-canonical]

Description

Juju validates on PRs that the schema file is up to date.

python-libjuju validates on PRs that generated code matches the manually maintained dictionaries of supported and not-yet-supported facade versons.

One missing link here is that python-libjuju should also validate that the current generated code matches the current schema files. This would both validate that make client has been run after checking in a schema file, which will be helpful for making sure the proper process is followed for future python-libjuju releases, and provide some validation for the code generation itself, which will be helpful if we every try to refactor it.

Code I'd Like to Run

pytest tests/validate/test_facades.py::test_generated_code_matches_schemas