[fix] AutoQuant: clamp instead of use fp64 in auto quant score (#1156)

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<!-- This is an auto-generated comment: release notes by coderabbit.ai
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## Summary by CodeRabbit

* **Bug Fixes**
* Improved numeric stability in quantization score calculations by
introducing saturation bounds, preventing potential overflow during
intermediate value processing and ensuring more robust computation
across a wider range of input values.

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Signed-off-by: Fridah-nv <201670829+Fridah-nv@users.noreply.github.com>

Author: Fridah-nv

modelopt/torch/quantization/algorithms.py

@@ -764,7 +764,7 @@ def run_search(self):
 
 def _get_auto_quantize_score(grad_output, output_diff):
     x = grad_output.float() * output_diff.float()
-    return x.to(torch.float64).square().sum()
+    return x.clamp(-1e10, 1e10).square().sum()
 
 
 def _add_auto_quantize_score(grad_output, output_diff, score_tensor):