chore: rearrange github actions a bit

[rtyler]

This ensures that the benchmarking and codecov code doesn't run in the merge queue where it doesn't make sense (and also causes unsightly ❌ )

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.48%. Comparing base (45bda3f) to head (04e90a2).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2868      +/-   ##
==========================================
+ Coverage   72.46%   72.48%   +0.01%     
==========================================
  Files         132      132              
  Lines       40057    40057              
  Branches    40057    40057              
==========================================
+ Hits        29029    29035       +6     
  Misses       9159     9159              
+ Partials     1869     1863       -6     

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