delete outdated llama benchmarks

[vkuzo]

Summary:

Since #3473 landed which benchmarks
LLaMa models with HF model definition and vllm, we no longer need the
previous benchmarks we had which used a custom model definition.
Deleting all of them.

Note that benchmarks/_models/ is using HF model definition, but
deleting them too as #3473 is a more
modern version of these which includes performance.

Test Plan: CI

Reviewers:

Subscribers:

Tasks:

Tags:

[vkuzo]

Stack from ghstack (oldest at bottom):

• remove torchao/prototype/moe_quant #3554
• -> delete outdated llama benchmarks #3552

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/3552

• 📄 Preview Python docs built from this PR

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✅ You can merge normally! (1 Unrelated Failure)

As of commit a095beb with merge base 886ac8e ():

BROKEN TRUNK - The following job failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• Run Regression Tests / test-nightly (CUDA Nightly, linux.g5.12xlarge.nvidia.gpu, --pre torch --index-url https://downloa... / linux-job (gh) (trunk failure)
  test/test_low_bit_optim.py::TestFSDP2::test_fsdp2

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