remove concrete_solve tests

Author: ChrisRackauckas

test/downstream/concrete_solve_tests.jl

@@ -48,7 +48,6 @@ if !is_APPVEYOR && GROUP == "Downstream"
     @time @safetestset "PSOS and Energy Conservation Event Detection" begin include("downstream/psos_and_energy_conservation.jl") end
     @time @safetestset "DE stats" begin include("downstream/destats_tests.jl") end
     @time @safetestset "DEDataArray" begin include("downstream/data_array_regression_tests.jl") end
-    @time @safetestset "Concrete_solve Tests" begin include("downstream/concrete_solve_tests.jl") end
     @time @safetestset "AD Tests" begin include("downstream/ad_tests.jl") end
     @time @testset "Distributed Ensemble Tests" begin include("downstream/distributed_ensemble.jl") end
 end