Chore: Configure warnings as errors in pytest

[aaronsteers]

We haven't done any hygeine for warnings, and over time a large number of these have accumulated. When users see these, they can cause confusion - and worse, sometimes they are signs of real issues that need to be addressed.

This PR does a few things:

• Make warnings raise errors in PyTest.
• Add execptions to pyproject.toml for any errors we do expect.
• Update specific packages in pyproject.toml which are generating deprecation warnings.

[aaronsteers]

@bindipankhudi - FYI, this is a draft for now, but I hope to finish today. This came up when researching a user-facing issue.

[aaronsteers]

/poetry-lock

poetry lock job started... Check job output.

✅ poetry lock applied successfully.