Feature/hafs rtcases (#646)

Add HAFS related regression test into GSI Ctests to solve the issue
#600.

Four set of regression tests for the current suite of HAFSv1 GSI:

3DEnvar with GDAS Ensemble plus FGAT capability --
"hafs_3denvar_glbens".
4Denvar with GDAS Ensemble plus FGAT capability --
"hafs_4denvar_glbens".
3Envar with self-cycled HAFS Ensemble -- "hafs_3denvar_hafens".
3Envar with GDAS Ensemble plus self-cycled HAFS Ensemble --
"hafs_3denvar_hybens".

Fixes #600 
Partially fixes #647 

**Type of change**

- [ ] Bug fix (non-breaking change which fixes an issue)
- [x] New feature (non-breaking change which adds functionality)
- [ ] Breaking change (fix or feature that would cause existing
functionality to not work as expected)
- [ ] This change requires a documentation update

**How Has This Been Tested?**

These changes are tested under Orion through GSI Ctests.
  
**Checklist**

- [x ] My code follows the style guidelines of this project
- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas
- [x] New and existing tests pass with my changes
- [x] Any dependent changes have been merged and published

**DUE DATE for this PR is 12/4/2023.** If this PR is not merged into
`develop` by this date, the PR will be closed and returned to the
developer.

regression/CMakeLists.txt

@@ -38,9 +38,10 @@ endif()
 
 # GSI regression test names
 list(APPEND GSI_REG_TEST_NAMES
-  global_3dvar global_4dvar global_4denvar
-  hwrf_nmm_d2 hwrf_nmm_d3 rtma
+  global_4denvar
+  rtma
   rrfs_3denvar_glbens netcdf_fv3_regional
+  hafs_4denvar_glbens hafs_3denvar_hybens
 )
 
 # EnKF regression test names