[executorch] Add program-data separation example to test files

[lucylq]

Stack from ghstack (oldest at bottom):

• -> [executorch] Add program-data separation example to test files #7765
• [executorch][flat_tensor] flat tensor header #7764
• [executorch][core] NamedDataMap interface #7763
• [executorch][core] Add TensorLayout to core #7761
• [executorch][serialization] Serialize PTD files. #7270
• [executorch][flat_tensor] Serialize flat tensor tests #7269

Add to test env to use for testing in next diff.

Differential Revision: D67376339

[pytorch-bot]

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❌ 5 New Failures

As of commit ad05f63 with merge base 8494b90 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• Lint / lintrunner / linux-job (gh)
  >>> Lint for test/models/export_program.py:
• pull / test-phi-3-mini-runner-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 83723d4a3017321a374ec44e881f92391d479dd1e4321fbb3043d1ae660c7f4a /exec failed with exit code 2
• pull / unittest / linux / linux-job (gh)
  RuntimeError: Command docker exec -t 04fb455db5d1d9435b336ca7da1f8c9ec043c596d0a3605df9cdc37c03833814 /exec failed with exit code 2
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 2

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This pull request was exported from Phabricator. Differential Revision: D67376339

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