Make KV-offload eval CI steps non-optional
They were gated behind a manual Unblock button because `optional: true`
is checked before `source_file_dependencies` in the pipeline generator.
Remove the flag so the steps auto-trigger on offloading code changes.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Signed-off-by: Tyler Michael Smith <tlrmchlsmth@gmail.com>
