Don't require KERNEL_RPM_LIST

[coiby]

Currently, users need to run tools/generate_rhel_kernel_rpm_list.py manually to generate a list of kernel RPMs. It will be good if this can be automated so that KERNEL_RPM_LIST is not mandatory.

[github-actions]

🤖 Hi @coiby, I've received your request, and I'm working on it now! You can track my progress in the logs for more details.