[CI] Don't skip tests when uv.lock is updated

[ckadner]

Currently, the tests workflow runs on every PR but skips actually running the install and test steps when no source code was changed (PR #193) in order to complete PR checks more quickly and preserve GHA minutes, while allowing tests to be required PR check.

However, as witnessed in PR #213, https://github.com/vllm-project/vllm-spyre/actions/runs/15474000691/job/43565048121, tests don't run when only Python package versions are updated.

This PR changes that. Running full tests on uv.lock updates.

[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 🚀

[prashantgupta24]

Why do the 2 tests keep canceling?

tests/e2e/test_spyre_basic.py::test_output[v1-eager-warmup_shape0-prompts0-llama-194m] 
Error: The operation was canceled.

[ckadner]

No idea!? Restarted it several times 🤷🏻‍♂️ Has nothing to do with these changes though.

[prashantgupta24]

LGTM. Can merge once we fix the vllm main test though. Or I guess not.