OpenVINO Backend Build Updates

[cavusmustafa]

Summary

• OpenVINO build script updates
  • Removed "--minimal" argument for python build to include dependencies for examples.
  • By default, the script does not build llm dependencies in cpp runtime build. We added additional argument to include llm dependencies.
• Updated cmake files and requirements files accordingly.

Test plan

This PR doesn't include new functionality which requires testing.

cc: @mergennachin @cbilgin @digantdesai @ynimmaga @suryasidd @daniil-lyakhov @anzr299

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15650

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 885d630 with merge base 57f0dfd ():

NEW FAILURE - The following job has failed:

• pull / test-openvino-linux / linux-job (gh)
  AttributeError: '_OpNamespace' 'quantized_decomposed' object has no attribute 'convert_element_type'

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• pull / test-models-linux-basic (mv3, portable, buck2, linux.2xlarge, executorch-ubuntu-22.04-clang12) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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