Arm backend: Move Ethos-U backend to generate TOSA-1.0

[oscarandersson8218]

Summary

Move to use TOSA 1.0 for Vela compiler to consume. Vela compiler is updated to have support for TOSA 1.0.

Test plan

Internal and external CI unit tests.

cc @digantdesai @freddan80 @per @zingo

[pytorch-bot]

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❌ 1 Cancelled Job, 6 Unrelated Failures

As of commit 1b46f8a with merge base 478032a ():

CANCELLED JOB - The following job was cancelled. Please retry:

• trunk / test-arm-backend (test_models_ethos-u85) / linux-job (gh)
  ##[error]The operation was canceled.

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

• trunk / unittest-release / macos / macos-job (gh) (similar failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config

BROKEN TRUNK - The following jobs failed but was present on the merge base:

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest / macos / macos-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  extension/llm/export/test/test_export_llm.py::TestExportLlm::test_with_config

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[zingo]

@digantdesai and @mergennachin this one might be good to check and maybe test internally.
Vela version is updated.

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