Add NamedData to flat_tensor schema

[pytorchbot]

This PR was created by the merge bot to help merge the original PR into the main branch.
ghstack PR number: #9123 by @lucylq
^ Please use this as the source of truth for the PR details, comments, and reviews
ghstack PR base: https://github.com/pytorch/executorch/tree/gh/lucylq/57/base
ghstack PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/57/head
Merge bot PR base: https://github.com/pytorch/executorch/tree/main
Merge bot PR head: https://github.com/pytorch/executorch/tree/gh/lucylq/57/orig
@diff-train-skip-merge

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❌ 3 New Failures

As of commit 4e99460 with merge base 94ec549 ():

NEW FAILURES - The following jobs have failed:

• Check Labels / Check labels (gh)
  RuntimeError: Error checking labels: PR does not have required labels
• pull / android / build-llm-demo / linux-job (gh)
  RuntimeError: Command docker exec -t 6bb25ac0e16b41758642480813d3465c0224113f43140a3859754d91ced2fca5 /exec failed with exit code 1
• pull / test-models-linux (phi_4_mini, portable, linux.4xlarge.memory) / linux-job (gh)
  RuntimeError: Model phi_4_mini is not a valid name. Available models are ['mul', 'linear', 'add', 'add_mul', 'softmax', 'dl3', 'edsr', 'emformer_transcribe', 'emformer_predict', 'emformer_join', 'llama2', 'llama', 'llama3_2_vision_encoder', 'lstm', 'mobilebert', 'mv2', 'mv2_untrained', 'mv3', 'vit', 'w2l', 'ic3', 'ic4', 'resnet18', 'resnet50', 'llava', 'efficient_sam', 'qwen2_5', 'phi-4-mini'].

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