Disable Catchment-CN4.5 land model choice in GEOSldas

[gmao-jkolassa]

This PR disables the option of running the Catchment-CN4.5 land model (LSM_CHOICE=3) for GEOSldas. The experiment configuration file (exeinp) no longer includes Catchment-CN4.5 or its associated parameter set as an option. When a user runs ldas_setup with LSM_CHOICE=3, they will get the following error message:

LSM_CHOICE=3 (Catchment-CN4.5) is no longer supported. Please set LSM_CHOICE to 1 (Catchment) or 2 (Catchment-CN4.0

This PR is connected to a PR in the GEOSgcm_GridComp repository that removes the CN_CLM45 parameter set from GEOS_SurfaceGridComp.rc (so it is no longer listed in the exeinp file).

This PR is zero-diff for all model configurations that do not use Catchment-CN4.5.

Notes:

• In its current form, this PR only disables the Catchment-CN4.5 model option. Removal of the Catchment-CN4.5 source code, references to LSM_CHOICE=3 in other parts of the code, and updates to the history routines will be addressed in a future PR. @gmao-rreichle , please let me know if you would like any of the above changes to be included in this PR.
• This PR only disables the Catchment-CN4.5 land model option for offline simulations. Equivalent changes to the gcm_setup are needed to also disable this land model option for coupled model simulations.

cc: @biljanaorescanin , @weiyuan-jiang

[gmao-rreichle]

I verified that the PR works as intended and will go ahead with the merg. @mathomp4: This will result in the failure of the CNCLM45 tests, which need to be removed from the list of automated GEOSldas nightly tests.