Exclude farkas unit tests

[blegat]

These tests were added to MOI master but SDPAFamily is failing with them:
https://github.com/blegat/SolverTests/runs/1941116889

[codecov-io]

Codecov Report

Merging #41 (40577c2) into master (4fdcad7) will increase coverage by 1.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master      #41      +/-   ##
==========================================
+ Coverage   86.20%   87.27%   +1.06%     
==========================================
  Files           6        6              
  Lines         522      558      +36     
==========================================
+ Hits          450      487      +37     
+ Misses         72       71       -1     

Impacted Files	Coverage Δ
src/file_io.jl	100.00% <0.00%> (ø)
src/SDPAFamily.jl	66.66% <0.00%> (ø)
src/presolve.jl	98.24% <0.00%> (+0.13%)	⬆️
src/binary_call.jl	82.19% <0.00%> (+1.03%)	⬆️
src/MOI_wrapper.jl	80.14% <0.00%> (+1.74%)	⬆️
src/params.jl	91.17% <0.00%> (+2.28%)	⬆️

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[ericphanson]

Thanks!