Speed up dominated columns reduction

[fwesselm]

• This PR speeds up the dominated columns reduction (HPresolve::dominatedColumns) for models with many columns.
• Testing on 850+ MIPs did not reveal any regressions. Only 13 models are affected by these code changes and the ratio between the shifted geometric means of the running times is 1.0, so (average) performance is not affected.

[codecov]

Codecov Report

❌ Patch coverage is 89.47368% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.11%. Comparing base (f6c3703) to head (384b9af).
⚠️ Report is 15 commits behind head on latest.

Files with missing lines	Patch %	Lines
highs/presolve/HPresolve.cpp	89.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2639      +/-   ##
==========================================
+ Coverage   81.08%   81.11%   +0.02%     
==========================================
  Files         349      349              
  Lines       85328    85466     +138     
==========================================
+ Hits        69191    69325     +134     
- Misses      16137    16141       +4     

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[jajhall]

Fine by me, thanks @fwesselm