Remove FlatTensor from OSSTestConfig.json

[lucylq]

Summary

OSSTestConfig.json is only used to generate cmake files. I generated the flat tensor cmake file using it, and then edited it to create the test pte files. Removing flat tensor from the config so that future cmake generation runs do not overwrite the file.

Test plan

ci

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/8472

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❌ 1 New Failure, 1 Unrelated Failure

As of commit 4aeba20 with merge base 0222074 ():

NEW FAILURE - The following job has failed:

• pull / unittest-arm / linux-job (gh)
  RuntimeError: Command docker exec -t 04cd16c50bd3afbb4d0acce8b6dbff1004a05c9b8eb846631a0084f9ddd5e5b7 /exec 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

• pull / android / run-emulator (gh) (trunk failure)
  The process '/usr/bin/sh' failed with exit code 1

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[swolchok]

shipit (I miss macros)