Fix for overriding installed executorch when running optimum-et models

[guangy10]

Summary

Running install_dev.py for optimum-executorch will force overriding installed executorch and torch deps to the pinned nightly in optimum-executorch. In ExecuTorch CI including the benchmark, we would want to always run the optimum-executorch models with ExecuTorch from source to catch issues/regressions.

Test plan

Verified the installed deps in the CI and benchmark jobs

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11745

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure

As of commit 84dad53 with merge base 7b39a0c ():

NEW FAILURE - The following job has failed:

• pull / unittest-editable / macos / macos-job (gh)
  backends/xnnpack/test/ops/test_add.py::TestAdd::test_qs8_add_relu_seq

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[huydhn]

Oh, good catch!