add GPU AMIP scaling runs

[juliasloan25]

Purpose

closes #663

note: we want to use the slurm_exclusive: flag to get a GPU that's being used for only the performance job, but this seems not to be working when used in Atmos

Need to use ClimaAtmos#fdf1df4 commit to include PR containing atmos config files. Can't use main because of dependency incompatibilities.

Content

• [x] add GPU performance buildkite pipeline
• [x] add SYPD calculation to driver (use calculation from atmos so we're consistent)
• [x] add configs for 1-, 2-, and 4-GPU AMIP runs based on ClimaAtmos chap runs
  • do for both strong and weak scaling
• [x] add runs in buildkite/gpu/pipeline.yml
• [ ] manually trigger pipeline to check that these runs succeed on clima

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• [ ] I have read and checked the items on the review checklist.