Promote pyproject beta to production/stable

[mergennachin]

Will land this PR and cherry-pick to release/1.0 branch as we approach to 1.0 release.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14777

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❌ 1 New Failure

As of commit d95ffc3 with merge base 3557edf ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  export/tests/test_target_recipes.py::TestTargetRecipes::test_linear_model

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[mergennachin]

@pytorchbot cherry-pick --onto release/1.0 -c release

[pytorchbot]

Cherry picking #14777

The cherry pick PR is at #15025 The following tracker issues are updated:

• [v1.0.0] Release Tracker #14288 (comment)

Details for Dev Infra team

Raised by workflow job