[CB] remove VLLM_SPYRE_RM_PADDED_BLOCKS, enable the feature by default

[yannicks1]

[CB] remove VLLM_SPYRE_RM_PADDED_BLOCKS, enable the feature by default

This PR removes VLLM_SPYRE_RM_PADDED_BLOCKS and enables the removal of padded blocks by default. The feature is working on AIU Spyre, hence there is no need for turning it off anymore.

[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 🚀

[joerunde]

I love negative diff

[prashantgupta24]

Nice! Some nits

[prashantgupta24]

Worth adding a comment on why the tkv decreased since left padding reduction is default now

[prashantgupta24]

Not sure if get_params_test_remove_left_padding still has any value left since removing the left padding is the default cc @sducouedic

[yannicks1]

good point, do you agree @sducouedic ?

[sducouedic]

yep we should remove that one

[sducouedic]

yep we should remove that one