[Triton] DSV4 GEMM changed to mxfp8 GEMM

[k50112113]

This PR adds ATOM_FP8_BLOCKSCALE_USE_MXFP8 env var switch all the projection GEMMs to mxfp8 quantization format

This PR depends on: ROCm/aiter#3286

local-completions ({'model': '/data/deepseek-ai/DeepSeek-V4-Pro', 'base_url': 'http://localhost:8000/v1/completions', 'num_concurrent': 65, 'max_retries': 2, 'tokenized_requests': False}), gen_kwargs: ({}), limit: 100.0, num_fewshot: 3, batch_size: 1
|Tasks|Version|     Filter     |n-shot|  Metric   |   |Value|   |Stderr|
|-----|------:|----------------|-----:|-----------|---|----:|---|-----:|
|gsm8k|      3|flexible-extract|     3|exact_match|↑  | 0.95|±  |0.0219|
|     |       |strict-match    |     3|exact_match|↑  | 0.95|±  |0.0219|

This PR
============ Serving Benchmark Result ============
Successful requests:                     512       
Benchmark duration (s):                  258.17    
Total input tokens:                      524288    
Total generated tokens:                  524288    
Request throughput (req/s):              1.98      
Output token throughput (tok/s):         2030.81   
Total Token throughput (tok/s):          4061.63   
---------------Time to First Token----------------
Mean TTFT (ms):                          2058.78   
Median TTFT (ms):                        2190.25   
P99 TTFT (ms):                           4948.53   
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          29.53     
Median TPOT (ms):                        29.38     
P99 TPOT (ms):                           31.06     
---------------Inter-token Latency----------------
Mean ITL (ms):                           29.50     
Median ITL (ms):                         28.69     
P99 ITL (ms):                            30.13     
==================================================

Baseline
============ Serving Benchmark Result ============
Successful requests:                     512       
Benchmark duration (s):                  259.28    
Total input tokens:                      524288    
Total generated tokens:                  524288    
Request throughput (req/s):              1.97      
Output token throughput (tok/s):         2022.13   
Total Token throughput (tok/s):          4044.26   
---------------Time to First Token----------------
Mean TTFT (ms):                          1970.23   
Median TTFT (ms):                        2201.64   
P99 TTFT (ms):                           3883.61   
-----Time per Output Token (excl. 1st token)------
Mean TPOT (ms):                          29.75     
Median TPOT (ms):                        29.76     
P99 TPOT (ms):                           31.30     
---------------Inter-token Latency----------------
Mean ITL (ms):                           29.72     
Median ITL (ms):                         28.91     
P99 ITL (ms):                            30.15     
==================================================