[FEA]: Add tunings for `DeviceSegmentedReduce` with fixed segment size

### Is this a duplicate?

- [x] I confirmed there appear to be no [duplicate issues](https://github.com/NVIDIA/cccl/issues) for this request and that I agree to the [Code of Conduct](CODE_OF_CONDUCT.md)

### Area

CUB

### Is your feature request related to a problem? Please describe.

#3969 adds fixed size segmented reduce, but not been tuned.

### Describe the solution you'd like

Add/Extended newer tuning policies [here](https://github.com/NVIDIA/cccl/blob/main/cub/cub/device/dispatch/tuning/tuning_reduce.cuh#L274-L314)

### Describe alternatives you've considered

_No response_

### Additional context

_No response_