Remove benchmark job

[benjeffery]

Fixes #2965

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.06%. Comparing base (abe75c2) to head (bc4d6e7).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #3220      +/-   ##
==========================================
+ Coverage   89.63%   90.06%   +0.43%     
==========================================
  Files          28       27       -1     
  Lines       32000    24709    -7291     
  Branches     5877     4575    -1302     
==========================================
- Hits        28684    22255    -6429     
+ Misses       1886     1358     -528     
+ Partials     1430     1096     -334     

Flag	Coverage Δ
c-tests	86.66% <ø> (ø)
lwt-tests	80.38% <ø> (ø)
python-c-tests	?
python-tests	98.86% <ø> (+<0.01%)	⬆️

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see 2 files with indirect coverage changes

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