Add CO2, CO, and OCS single-tracer carbon simulations to the integration tests

[msulprizio]

Name and Institution (Required)

Name: Melissa Sulprizio
Institution: Harvard

Describe the update

The carbon simulation will soon replace the existing CO2, CH4, and tagCO specialty simulations. We now add single-tracer carbon simulations for CO2, CO, and OCS (CH4 was added previously) to the GCClassic and GCHP integration tests.

Expected changes

This is a zero difference update with respect to the full-chemistry benchmark simulation.

[msulprizio]

The additional CO, CO2, and OCS integration tests all pass for GCClassic.

Execution tests:
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gc_4x5_merra2_aerosol...............................Execute Simulation....PASS
gc_4x5_merra2_carbon................................Execute Simulation....PASS
gc_4x5_merra2_carbon_CH4............................Execute Simulation....PASS
gc_4x5_merra2_carbon_CO.............................Execute Simulation....PASS
gc_4x5_merra2_carbon_CO2............................Execute Simulation....PASS
gc_4x5_merra2_carbon_OCS............................Execute Simulation....PASS
gc_4x5_merra2_CH4...................................Execute Simulation....PASS
gc_4x5_merra2_CO2...................................Execute Simulation....PASS
gc_4x5_merra2_fullchem..............................Execute Simulation....PASS

They are failing for GCHP as discussed in #2237.

[msulprizio]

GCHP integration tests now all pass:

==============================================================================
GCHP: Execution Test Results

GCHP      #6db5506 GEOS-Chem submodule update: Merge PR #1992 (carbon simulation fixes)
GEOS-Chem #0139486ac Add fixes for GCHP carbon simulations with single species (CO, CO2, OCS)
HEMCO     #fddcae5 Update version to 3.8.1 for release

Number of execution tests: 11

Submitted as SLURM job: 27703529
==============================================================================
 
Execution tests:
------------------------------------------------------------------------------
gchp_merra2_carbon..................................Execute Simulation....PASS
gchp_merra2_carbon_CH4..............................Execute Simulation....PASS
gchp_merra2_carbon_CO...............................Execute Simulation....PASS
gchp_merra2_carbon_CO2..............................Execute Simulation....PASS
gchp_merra2_carbon_OCS..............................Execute Simulation....PASS
gchp_merra2_fullchem................................Execute Simulation....PASS
gchp_merra2_fullchem_benchmark......................Execute Simulation....PASS
gchp_merra2_fullchem_RRTMG..........................Execute Simulation....PASS
gchp_merra2_fullchem_TOMAS15........................Execute Simulation....PASS
gchp_merra2_tagO3...................................Execute Simulation....PASS
gchp_merra2_TransportTracers........................Execute Simulation....PASS
 
Summary of test results:
------------------------------------------------------------------------------
Execution tests passed: 11
Execution tests failed: 0
Execution tests not yet completed: 0

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%%%  All execution tests passed!  %%%
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[yantosca]

Thanks @msulprizio! Good to merge!