Improve matmul autotune

[nathanielsimard]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 35.20%. Comparing base (5d622ae) to head (b614df0).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/burn-cubecl-fusion/src/matmul/tune.rs	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3378      +/-   ##
==========================================
+ Coverage   30.91%   35.20%   +4.28%     
==========================================
  Files         413      342      -71     
  Lines       60529    53159    -7370     
==========================================
  Hits        18712    18712              
+ Misses      41817    34447    -7370     

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