Improve graph transformer DoubleQDQPairsRemover (#16910)
Improve graph transformer DoubleQDQPairsRemover
### Description
Improve DoubleQDQPairsRemover to not reset the scale & zero point if
existing value are same on the target DQ & Q nodes.
### Motivation and Context
Fix a bug that DoubleQDQPairsRemover reset the scale value while
removing unnecessary DQ & Q nodes.
