Arm backend: Updated how generic evaluator is handled

[Michiel-Olieslagers]

Currently using the generic evaluator leads to a dataset of "None" being used. This patch reverts the dataset to being defaulted to example inputs for the generic evaluator.

Change-Id: I7bdb3161d6339eadc50a1d3a73d592119fa87587

cc @freddan80 @per @zingo @oscarandersson8218 @digantdesai

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14940

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❌ 3 New Failures, 3 Pending, 1 Unrelated Failure

As of commit 69bb7f2 with merge base d8e07bd ():

NEW FAILURES - The following jobs have failed:

• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t eff08a2086705e983975876018fedf03912086ab0b02951fe1fe4a77d8cd3624 /exec failed with exit code 1
• Test CUDA Builds / test-voxtral-cuda-e2e / linux-job (gh)
  RuntimeError: Command docker exec -t d583af65f26cbd471579fd6432094f8161699ece65ceced25244b0502a4f5ce5 /exec failed with exit code 2
• trunk / test-qnn-optimum-model (fp32, efficientnet) / linux-job (gh)
  RuntimeError: Command docker exec -t 5beff9dc0cc336cf9c73e881ef91ce198bb63b2a7efc1f24f6e691f6ce638e9b /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

• Apple / build-demo-ios / macos-job (gh) (trunk failure)
  RuntimeError: Command bash /Users/runner/work/_temp/exec_script failed with exit code 74

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