Simplify row presolve

[fwesselm]

• Reduce amount of similar / duplicate code in HPresolve::rowPresolve().
• Ran 850+ MIPs, only two instances show a minor change in the node counts. The overall performance in terms of relative shifted geometric means is very similar.

[codecov]

Codecov Report

Attention: Patch coverage is 86.90476% with 11 lines in your changes missing coverage. Please review.

Project coverage is 78.95%. Comparing base (9ac2d41) to head (8a1cbfa).
Report is 34 commits behind head on latest.

Files with missing lines	Patch %	Lines
src/presolve/HPresolve.cpp	86.90%	11 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           latest    #2190      +/-   ##
==========================================
+ Coverage   78.92%   78.95%   +0.02%     
==========================================
  Files         345      345              
  Lines       83240    83202      -38     
==========================================
- Hits        65701    65688      -13     
+ Misses      17539    17514      -25     

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