perf: Don't rechunk by default in concat

[ritchie46]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 80.96%. Comparing base (f18c306) to head (72bec1e).
Report is 2 commits behind head on main.

❗ Current head 72bec1e differs from pull request most recent head 8e90612. Consider uploading reports for the commit 8e90612 to get more accurate results

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #16128   +/-   ##
=======================================
  Coverage   80.95%   80.96%           
=======================================
  Files        1386     1386           
  Lines      178441   178440    -1     
  Branches     2883     2883           
=======================================
+ Hits       144452   144467   +15     
+ Misses      33494    33480   -14     
+ Partials      495      493    -2     

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[codspeed-hq]

CodSpeed Performance Report

Merging #16128 will not alter performance

_{Comparing concat (8e90612) with main (16245cd)}

Summary

✅ 35 untouched benchmarks