Fix supports_constraint(::Optimizer, ::Type{VariableIndex}, ::Type{ZeroOne})

[odow]

Closes #241

I didn't test locally, so let's see what the impact is.

[odow]

@joaquimg now I remember. I originally wanted to test simplex/ipm with/out presolve. Not really for HiGHS.jl, mainly for upstream verification. But because HiGHS ignores binaries with simplex/ipm, I added that in so we would skip the relevant tests.

I've removed the simplex/ipm tests. It's not our job to test every combination of options.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.77%. Comparing base (201cbed) to head (2510622).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #242      +/-   ##
==========================================
- Coverage   99.77%   99.77%   -0.01%     
==========================================
  Files           1        1              
  Lines        1353     1352       -1     
==========================================
- Hits         1350     1349       -1     
  Misses          3        3              

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[joaquimg]

That makes sense, it was really weird to have that check only in HiGHS