🐛 fixup more tests to use the default max model length

[joerunde]

Description

Following up on #509, this fixes up a few remaining tests that were setting their own max model lengths instead of using the default. Using the default makes it much easier to respond to changes in hardware support

[github-actions]

👋 Hi! Thank you for contributing to vLLM support on Spyre.
Just a reminder: Make sure that your code passes all the linting checks, otherwise your PR won't be able to be merged. To do so, first install the linting requirements, then run format.sh and commit the changes. This can be done with uv directly:

uv sync --frozen --group lint --active --inexact

Or this can be done with pip:

uv pip compile --group lint > requirements-lint.txt
pip install -r requirements-lint.txt
bash format.sh

Now you are good to go 🚀

[wallashss]

LPGTM

[jberkhahn]

i like defaults, even if they use horrible monkeypatching

[joerunde]

Technically most of these aren't monkeypatching, they're just using pytest parameterization!