Cleanup: Remove duplicate quantization checks

[sdasgup3]

The recent upstream change have introduced quantization checks that are
already present in the StableHLO core library. This commit removes these duplicate
checks to avoid redundancy and potential inconsistencies.

Checks proposed to be removed	StableHLO Code	Upstream MLIR
channel-axis >= 0	cs	cs
scale within smallest and largest finite numbers determined by expressed_type	cs	cs1 cs2

Note that StableHLO has checks like quantization_dimension < rank(self) and
dim(self, quantization_dimension) = size(scales) implemented at cs. In upstream MLIR similar checks cs are encoded as part of dcast and qcast ops and hence cannot be claimed as duplicate.

related upstream clean-up llvm/llvm-project#110604

[sdasgup3]

@abhigunj We can merge this "after" the LLVM integrate bringing the change.

[abhigunj]

@abhigunj We can merge this once "after" the LLVM integrate bringing the change.

Thank you for taking care of the clean up, I was planning to do it during LLVM revision bump.

[sdasgup3]

Thanks @abhigunj!

As part of integrate we still have to update the quantized tests to fix the error messages. This change can land later as these will be unused at that point.

[GleasonK]

Should we move this to a TD file? Or somewhere else for searchability?