Drop QDQ around more nodes (#21376)
### Description
Extends the Drop QDQ optimization to remove DequantizeLinear and
QuantizeLinear nodes from around operators:
- Flatten
- Expand
- Tile
- Slice
- GatherElements
- ReduceMin
- ReduceMax
### Motivation and Context
To reduce floating-point conversions in quantize inference. Mainly
motivated by the Flatten case, since that will show up in graphs
exported from PyTorch to ONNX. But to make the change complete,
extending to a larger set of ops for which this optimization is valid.
https://github.com/microsoft/onnxruntime/issues/21375
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Co-authored-by: Edward Chen <18449977+edgchen1@users.noreply.github.com>
