Add missing BUCK file

[bigfootjon]

No description provided.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/16588

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❌ 1 New Failure, 24 Pending

As of commit 425fcde with merge base f5035c6 ():

NEW FAILURE - The following job has failed:

• pull / unittest / macos / macos-job (gh)
  examples/models/test/test_export.py::ExportTest::test_mv3_export_to_executorch

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• ⏳ pull / android / run-emulator (gh) (#16137)

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[Copilot]

Pull request overview

This PR adds a minimal BUCK file to the devtools/bundled_program/serialize/test/ directory to resolve a build system error that was blocking code landing. The file follows the same pattern as other placeholder BUCK files in the repository.

Changes:

• Added a new BUCK file with oncall declaration to satisfy the build system requirements

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