Merge `polaris-cuda122` branch into main

[saforem2]

• Adds support for cuda=12.2 on Polaris @ ALCF

  • Uses new conda/2024-04-29 base environment

    $ module use /soft/modulefiles
    $ module load conda/2024-04-29
    $ conda activate base

• Add new ALCF/data-lists/{sunspot,polaris}/*.txt with Dolma v1.7 data set

• Update to launching mechanism

  • Will use mpiexec to launch by default
  • Can be toggled to launch with deepspeed by overriding the LAUNCH_CMD=deepspeed bash train_llama_alcf.sh
    • Note: If not set, LAUNCH_CMD=MPICH will be default, and we will launch with mpiexec on {Polaris, Sunspot}