Remove --no-use-pep517 from pip install commands

[Copilot]

Summary

Removes deprecated --no-use-pep517 flag from pip install commands. The flag was deprecated in pip 21.3 (Oct 2021) and removed in pip 23.1 (May 2023). PEP 517 is now the default build system.

Changes:

• Removed --no-use-pep517 from torchvision and torchaudio installation commands in .ci/docker/common/install_pytorch.sh

Test plan

CI validation. The pip install commands will use PEP 517 by default, which is the modern standard for Python package builds.

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🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16170

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