Use PTEFile class in serialize_pte_binary

[lucylq]

Stack from ghstack (oldest at bottom):

• -> #15801
• #15800

Take in a PTE file for serialization instead of program, mutable_segments, named_data segments separately.

Differential Revision: D86908241

[pytorch-bot[bot]]

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:test_tube: See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15801

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:x: 6 New Failures, 3 Unrelated Failures

As of commit 41d4aca8ace8705ac821c8443b23c2aabc503e02 with merge base b1e3e28bb611e06d484138be27221faffd89f565 ():

NEW FAILURES - The following jobs have failed:

• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, non-quantized) / linux-job (gh) RuntimeError: Command docker exec -t ddec3b7b36182660b93524e8a1b2dbbe9e229abdb0afa12a950e2d93f24e6fbb /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-tile-packed) / linux-job (gh) RuntimeError: Command docker exec -t f689e44f85f58355d9a03abdf0255a6cfeae13e2cc2b48518bd8de582a9e019b /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-large-v3-turbo, quantized-int4-weight-only) / linux-job (gh) RuntimeError: Command docker exec -t 64948aeafc08e61f2636ea863a3e4cdd394f8778201dcab8383d3b00c3871b5c /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, non-quantized) / linux-job (gh) RuntimeError: Command docker exec -t f7423ee5f2e1d34782357a12f847c8f616c5b9b97fafe5345e25ef04f0f39a94 /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-tile-packed) / linux-job (gh) RuntimeError: Command docker exec -t f111cc914189cf941cb679b21c87b775c8f98ad0bfc6e063dbd0033f6927c69e /exec failed with exit code 1
• Test CUDA Builds / test-model-cuda-e2e (openai, whisper-small, quantized-int4-weight-only) / linux-job (gh) RuntimeError: Command docker exec -t 51b8a675db6fe40817374c90b1a812902068c672c8bd871a431dce80552d3306 /exec failed with exit code 1

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-linux (fp32, xnnpack+custom+quantize_kv, linux.arm64.2xlarge, executorch-ubuntu... / linux-job (gh) (matched linux rule in flaky-rules.json) The runner has received a shutdown signal. This can happen when the runner service is stopped, or a manually started runner is canceled.
• Test Metal Backend / test-model-metal-e2e (openai, whisper-small, non-quantized) / macos-job (gh) (similar failure) RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

BROKEN TRUNK - The following job failed but were present on the merge base:

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

• Test Metal Backend / test-model-metal-e2e (openai, whisper-large-v3-turbo, non-quantized) / macos-job (gh) (trunk failure) RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1

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