[test][rans] add a test with HasChannelGeometry set as false (komega)

dumux/common/parameters.hh

dumux/freeflow/rans/problem.hh

test/freeflow/rans/CMakeLists.txt

test/freeflow/rans/params.input

test/freeflow/rans/params_nonisothermal.input

test/freeflow/rans/params_nonisothermal_wallfunction.input

test/freeflow/rans/params_wallfunction.input

test/freeflow/rans/scripts/params_verbose.input

test/freeflow/ransnc/params.input

test/freeflow/ransnc/params_nonisothermal.input

test/freeflow/ransnc/params_nonisothermal_wallfunction.input

test/freeflow/ransnc/params_wallfunction.input

...es/test_ff_rans_lauferpipe_komega_nochannel-reference.vtu