[export] Rewrite exportdb formatting.

[zhxchen17]

Summary: It'll be easier to generate examples if the code doesn't depend on exportdb library.

Test Plan: CI

Differential Revision: D58886554

[pytorch-bot]

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❌ 2 New Failures, 5 Unrelated Failures

As of commit 4933fb5 with merge base ad76da6 ():

NEW FAILURES - The following jobs have failed:

• trunk / macos-py3-arm64 / test (default, 2, 3, macos-m1-stable) (gh)
  export/test_db.py::ExampleTests::test_exportdb_supported_case_assume_constant_result
• trunk / macos-py3-arm64 / test (default, 3, 3, macos-m1-stable) (gh)
  export/test_serialize.py::TestSerialize::test_canonicalize

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• trunk / macos-py3-arm64 / test (default, 1, 3, macos-m1-stable) (gh) (similar failure)
  test_fake_tensor.py::FakeTensorTest::test_export_numpy

BROKEN TRUNK - The following jobs failed but was present on the merge base:

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

• trunk / linux-focal-rocm6.1-py3.8 / test (default, 1, 2, linux.rocm.gpu) (gh) (trunk failure)
  test_nn.py::TestNNDeviceTypeCUDA::test_module_to_empty_cuda_float32
• trunk / macos-py3-arm64-mps / test (mps, 1, 1, macos-m1-13) (gh) (trunk failure)
  test_mps.py::TestMPS::test_mps_allocator_module
• trunk / macos-py3-arm64-mps / test (mps, 1, 1, macos-m1-14) (gh) (trunk failure)
  test_mps.py::TestMPS::test_mps_allocator_module

UNSTABLE - The following job failed but was likely due to flakiness present on trunk and has been marked as unstable:

• inductor / rocm6.1-py3.8-inductor / test (inductor, 1, 1, linux.rocm.gpu.2, unstable) (gh) (#128871)
  'test/inductor/test_max_autotune.py::TestTuningProcess::test_tuning_pool_multiple_devices'

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[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D58886554

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D58886554

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D58886554

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D58886554

[facebook-github-bot]

This pull request was exported from Phabricator. Differential Revision: D58886554

[facebook-github-bot]

@pytorchbot merge -f 'Landed internally'

(Initiating merge automatically since Phabricator Diff has merged, using force because this PR might not pass merge_rules.json but landed internally)

[pytorchmergebot]

Merge started

Your change will be merged immediately since you used the force (-f) flag, bypassing any CI checks (ETA: 1-5 minutes). Please use -f as last resort and instead consider -i/--ignore-current to continue the merge ignoring current failures. This will allow currently pending tests to finish and report signal before the merge.

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