test: mark failing inversemodel solve as broken

Apparently this is due to a problem in `ControlSystemsBase``

Author: AayushSabharwal

test/downstream/inversemodel.jl

@@ -135,12 +135,12 @@ tspan = (0.0, 1000.0)
 prob = ODEProblem(ssys, op, tspan)
 sol = solve(prob, Rodas5P())
 
-@test SciMLBase.successful_retcode(sol)
+@test_broken SciMLBase.successful_retcode(sol)
 
 # plot(sol, idxs=[model.tank.xc, model.tank.xT, model.controller.ctr_output.u], layout=3, sp=[1 2 3])
 # hline!([prob[cm.ref.k]], label="ref", sp=1)
 
-@test sol(tspan[2], idxs = cm.tank.xc)≈getp(prob, cm.ref.k)(prob) atol=1e-2 # Test that the inverse model led to the correct reference
+@test_broken sol(tspan[2], idxs = cm.tank.xc)≈getp(prob, cm.ref.k)(prob) atol=1e-2 # Test that the inverse model led to the correct reference
 
 # we need to provide `op` so the initialization system knows what to hold constant
 # the values don't matter