IC2 - not tested in matrix

[JessicaMeixner-NOAA]

Is your feature request related to a problem? Please describe.
IC2 does not appear to be tested in the matrix of regression tests.

Describe the solution you'd like
Should have a test.

Additional context
This was noticed as a typo for IC2 precompiler directive was not noticed originally through regression testing: #1039

[ukmo-ccbunney]

A quick grep in the regtests directory suggests that there are tests that have IC2 as a switch:

/data/users/frey/WW3Git/UKMO_WW3/regtests [branch: feature/gpu/w3srce_refactor]
frey@vld225:> grep -l  IC2 */input*/switch*
ww3_tic1.1/input_IC2_ifr/switch
ww3_tic1.1/input_IC2_ifr/switch_IC2IS2
ww3_tic1.1/input_IC2_nondisp/switch
ww3_tic1.1/input_IC2_nrl/switch
ww3_tic1.4/input/switch_IC2IS2
ww3_tic2.3/input/switch_IC2IS2
ww3_tp2.14/input_oasacm2/switch_OASACM2
ww3_tp2.14/input_oasacm3/switch_OASACM3
ww3_tp2.14/input_oasacm4/switch_OASACM4
ww3_tp2.14/input_oasacm5/switch_OASACM5
ww3_tp2.14/input_oasacm6/switch_OASACM6
ww3_tp2.14/input_oasacm/switch_OASACM
ww3_tp2.14/input_oasicm/switch_OASICM
ww3_tp2.14/input_oasocm/switch_OASOCM
ww3_ts1/input_icesct_IC2/switch
ww3_ts4/input_rg_multi/switch
ww3_ts4/input_rg_multi/switch_MPI
ww3_ts4/input_rg_shel/switch
ww3_ts4/input_rg_shel/switch_MPI
ww3_ts4/input_ug/switch
ww3_ts4/input_ug/switch_MPI

so I don't really understand why they were not failing to compile. I will investigate a bit deeper when I get a chance.