remove skip test mathopt highs

[galabovaa]

follow up of:

• HiGHS updates to v1.8.0 #4417

[galabovaa]

@lperron

[Mizux]

Should we also remove this ?

or-tools/ortools/math_opt/solver_tests/status_tests.cc

Lines 376 to 378 in 0cf8ff8

	if (GetParam().solver_type == SolverType::kHighs) {
	GTEST_SKIP() << "Ignoring this test as Highs 1.7+ returns MODEL_INVALID";
	}

[galabovaa]

I will double check that it passes for me locally!

[galabovaa]

I get a failure if I comment out

or-tools/ortools/math_opt/solver_tests/status_tests.cc

Lines 376 to 378 in 0cf8ff8

	if (GetParam().solver_type == SolverType::kHighs) {
	GTEST_SKIP() << "Ignoring this test as Highs 1.7+ returns MODEL_INVALID";
	}

I will need to look into it further, so let's leave it for the next PR.