Remove deprecation warnings related to "NavierStokesMomentumCVFE" before release 3.7

There are multiple similar warnings: This file is deprecated and will be removed after 3.7. Use NavierStokesMomentumCVFE type tag.

Building CXX object test/freeflow/navierstokes/donea/CMakeFiles/test_ff_stokes_donea_momentum.dir/main_momentum.cc.o In file included from /dumux/test/freeflow/navierstokes/donea/properties_momentum.hh:54, from /dumux/test/freeflow/navierstokes/donea/main_momentum.cc:58: /dumux/dumux/freeflow/navierstokes/momentum/diamond/model.hh:48:2: warning: #warning "This file is deprecated and will be removed after 3.7. Use NavierStokesMomentumCVFE type tag." [-Wcpp] 48 | #warning "This file is deprecated and will be removed after 3.7. Use NavierStokesMomentumCVFE type tag." | ^~~~~~~ In file included from /dumux/test/freeflow/navierstokes/donea/properties_momentum.hh:57, from /dumux/test/freeflow/navierstokes/donea/main_momentum.cc:58: /dumux/dumux/freeflow/navierstokes/momentum/pq1bubble/model.hh:48:2: warning: #warning "This file is deprecated and will be removed after 3.7. Use NavierStokesMomentumCVFE type tag." [-Wcpp] 48 | #warning "This file is deprecated and will be removed after 3.7. Use NavierStokesMomentumCVFE type tag." | ^~~~~~~