Fix OFED clash with OHPC

[sjpb]

• Simplifies Packer image build variables
• By default, removes logs from image build
• Bumps OFED to version 24.07-0.6.1.0 for both RL8 and RL9
• Adds tests

TODO: check fat image build doesn't downgrade OFED packages
TODO: check lustre install doesn't remove verbs.h
TODO: after merge, move custom base images to -latest
TODO: update image build docs

[sjpb]

Base build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11627423791

RL9 build failed b/c trivy scan ratelimit
RL8 build succeded, then cancelled before ratelimit could cause problem
RL9 image built manually

[sjpb]

Fat image build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11629981626

[sjpb]

NB: above fatimage build is wrong, as it won't be on the -ofed24 image!

[sjpb]

Nightly build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11700865797

• cuda failed

[sjpb]

Nightly build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11702493281

[sjpb]

Nightly build above failing: cuda with package clash, non-cuda during shutdown??

Try with logs not being removed: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11706321077

[sjpb]

nightly build: https://github.com/stackhpc/ansible-slurm-appliance/actions/runs/11745963437