Fix message truncating logic to respect UTF8 encoding.

[pytorchbot]

Summary: .

Differential Revision: D82681904

[pytorch-bot]

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❌ 19 New Failures

As of commit c5778f5 with merge base e0dda90 ():

NEW FAILURES - The following jobs have failed:

• Build Presets / apple (ios-simulator) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / apple (ios) / build (gh)
• Build Presets / apple (llm) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / apple (macos) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / apple (profiling) / build (gh)
• Build Presets / apple (pybind) / build (gh)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 1
• Build Presets / linux (linux, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  RuntimeError: Command docker exec -t 87a9f785b6e966bdd843c7920ed43845d08a4d39e5e73eb666712b1389bbbcf2 /exec failed with exit code 1
• Build Presets / linux (linux, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
  RuntimeError: Command docker exec -t 837b7619068dc371521d4be3b986dbdb04b9d567911fab629d4c66ad2a1aad6e /exec failed with exit code 1
• Build Presets / linux (llm, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  RuntimeError: Command docker exec -t 7ac45b644b1d82e197e51967f30ef1da9f547a0baa5d710ed0a5c3653f68b23b /exec failed with exit code 1
• Build Presets / linux (llm, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
  RuntimeError: Command docker exec -t 6ff49ff749061c171709573b253074efeee1c4ee8863427dd4e5e88c152f89ff /exec failed with exit code 1
• Build Presets / linux (pybind, linux.2xlarge, executorch-ubuntu-22.04-clang12) / build (gh)
  RuntimeError: Command docker exec -t f50ba952518a78e719fa2cd3bed028ddd4f3851dbcb32e9a240a0c27e3d21362 /exec failed with exit code 1
• Build Presets / linux (pybind, linux.arm64.2xlarge, executorch-ubuntu-22.04-gcc11-aarch64) / build (gh)
• Build Presets / zephyr (zephyr) / build (gh)
  RuntimeError: Command docker exec -t 2e786dea2a32492f38f806dc769984b8bb72d0d406b3fd6a3cb034388d1a8a68 /exec failed with exit code 1
• pull / test-moshi-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 1ec42dc6ce88e3d466f52398a4ad2d60cf21d1ed6353c95af7cb68fa6301527b /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.10) / linux-job (gh)
  RuntimeError: Command docker exec -t ea95c2c66cdb158826e247e1bab63bd8d40702d33f22732250b30f8b89acd9f7 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.11) / linux-job (gh)
  RuntimeError: Command docker exec -t d03d8499bf6e5426913740df479071205e5454d9d6209b7b6f4c8be79874c897 /exec failed with exit code 1
• pull / test-qnn-wheel-packages-linux (3.12) / linux-job (gh)
  RuntimeError: Command docker exec -t 4f37fc86439f8ec0f50dc4b5eebd89e1740876ee57a6ec5e790d85d6d6cc4cbf /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 2c7dcff86c56c852c76d135b32a503d4f44e03c78d686afa8c3104fa8cdeefe4 /exec failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  exir/tests/test_quant_fusion_pass.py::TestQuantFusionPass::test_embedding_torchao

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