Add int32 quant/dequant back

[mcremon-meta]

Summary: Now that the previous diff exists, we can add the int32 case back without adding to the code size of deployed models.

Differential Revision: D82282481

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/14269

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❌ 3 New Failures, 1 Unrelated Failure

As of commit 2bac712 with merge base a523306 ():

NEW FAILURES - The following jobs have failed:

• Lint / android-java-format / linux-job (gh)
  RuntimeError: Command docker exec -t 1f36e1423b0cac499055e8d48db74064882f558cbeef36a21ed225ff0266c369 /exec failed with exit code 1
• pull / test-samsung-models-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 79e1c1a2c096cd1553c766cbea652fd33f37d314df416c89dc8d311e364cea24 /exec failed with exit code 1
• Test CUDA Builds / test-executorch-cuda-build-12.9 / linux-job (gh)
  RuntimeError: Command docker exec -t 5f41886b66a804cf2df34929e7c80be223fcf67b63da31c74865ef22128eb0e2 /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

• Test CUDA Builds / check-all-cuda-builds (gh) (trunk failure)

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