A minor change to HighsSymmetry

[fwesselm]

@Opt-Mucca, while checking the symmetry detection code, I realized that introducing an enum for the values of rowIsSetPacking may simplify the code a little. I hope you agree.

enum RowPackingStatus : int8_t {
    kRowUndetermined = -1,
    kRowNotPacking = 0,
    kRowPacking = 1,
    kRowPackingNegated = 2,
  };

[codecov]

Codecov Report

❌ Patch coverage is 10.52632% with 17 lines in your changes missing coverage. Please review.
✅ Project coverage is 72.80%. Comparing base (0e8db55) to head (2f0a20e).
⚠️ Report is 30 commits behind head on latest.

Files with missing lines	Patch %	Lines
highs/presolve/HighsSymmetry.cpp	0.00%	17 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           latest    #3032   +/-   ##
=======================================
  Coverage   72.80%   72.80%           
=======================================
  Files         417      417           
  Lines      102156   102151    -5     
  Branches    16467    16463    -4     
=======================================
+ Hits        74374    74375    +1     
+ Misses      27506    27500    -6     
  Partials      276      276           

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[Opt-Mucca]

Incredibly strong agree on this being more readable!