[Executorch][llm] Enable local global attention in export_llama script

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #10612 by @kimishpatel
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/189/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/189/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/gh/kimishpatel/188/orig
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/kimishpatel/189/orig
@diff-train-skip-merge

[pytorch-bot]

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• [PREEMPTIVE] Removal of ephemeral variants on scale-config.yml

❌ 13 New Failures

As of commit 7ee018b with merge base ef30b25 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 07e311aaebb1ff784d53ec7f71599db8eadd2be42f4b7e44a6afd1f288871ff6 /exec failed with exit code 1
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 02dc5c0d49ea122b49c908e251515b5ed9bf0168d0a9bd3f48a01bb8fe5c9e11 /exec failed with exit code 1
• pull / test-eval_llama-wikitext-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2ef7b4a9efe6e4457a7f2d93a93302f6c00004fd51fb93f274e599b1f7db8ee3 /exec failed with exit code 1
• pull / test-llama_runner_eager-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 43e284fe6e1cffef7100b7c7600ed58aae6b20db34487ec4e979b539b0108b74 /exec failed with exit code 1
• pull / test-llama-runner-linux (bf16, custom, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh)
  RuntimeError: Command docker exec -t fba164e869b00b6d446973377f3806cf1e109b397e7389518ff8994e9c147313 /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 472d3ef833d6b8eeb3e474df4b098f887afd39dae1be4431c6e22b342736a5d9 /exec failed with exit code 1
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 7e12e7aea7075a04c80a8e0e8d3e4b1afeefe0f634b54944dce2a854e67a7170 /exec failed with exit code 1
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Command docker exec -t 61bcfd1b8373c24f6a3207627e212a5e546e3d43a96a3b257ae099acb4a7a75c /exec failed with exit code 1
• pull / unittest / linux / linux-job (gh)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest / macos / macos-job (gh)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest-editable / linux / linux-job (gh)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts
• pull / unittest-editable / macos / macos-job (gh)
  examples/models/llama/tests/test_export_llama_lib.py::ExportLlamaLibTest::test_has_expected_ops_and_op_counts

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