CI: Remove Wang-Landau test from coverage builds

The test times out on CI runners under load when coverage is enabled.
The runtime increases from 220s on a runner without load to 280-300s
when 2 or more CI jobs are executed on the same runner.

testsuite/python/CMakeLists.txt

@@ -158,7 +158,9 @@ python_test(FILE analyze_distance.py MAX_NUM_PROC 1)
 python_test(FILE comfixed.py MAX_NUM_PROC 2)
 python_test(FILE rescale.py MAX_NUM_PROC 2)
 python_test(FILE accumulator.py MAX_NUM_PROC 4)
-python_test(FILE wang_landau_reaction_ensemble.py MAX_NUM_PROC 1 LABELS long)
+if(NOT WITH_COVERAGE)
+  python_test(FILE wang_landau_reaction_ensemble.py MAX_NUM_PROC 1 LABELS long)
+endif()
 python_test(FILE array_properties.py MAX_NUM_PROC 4)
 python_test(FILE analyze_distribution.py MAX_NUM_PROC 1)
 python_test(FILE observable_profile.py MAX_NUM_PROC 4)