Running ocean with different dt

[atrayano]

This PR moves the handling of the private clock to OGCM, and therefore should be merged simultaneously with PR #1461 (to GEOSgcm_GridComp repository).

[github-actions]

This PR is being prevented from merging because you have not added one of our required labels to say if they are 0-diff or non-0-diff for dataatm runs: 0 diff dataatm, non 0-diff dataatm. Please add so that the PR can be merged.

[github-actions]

This PR is being prevented from merging because you have not added one of our required labels to say if they are 0-diff or non-0-diff for dataatm runs: 0 diff dataatm, non 0-diff dataatm. Please add so that the PR can be merged.

[mathomp4]

@atrayano The gfortran build error is because gfortran doesn't allow splitting macros over multiple lines:

[100%] Building Fortran object src/Components/@GEOSgcm_GridComp/CMakeFiles/GEOSgcm_GridComp.dir/gc2gc.F90.o
/root/project/GEOSgcm/src/Components/@GEOSgcm_GridComp/gc2gc.F90:85:45:

   85 |        _ASSERT(tk==ESMF_TYPEKIND_R4, &
      |                                             1
Error: Syntax error in argument list at (1)

The ifort run error is:

forrtl: severe (408): fort: (7): Attempt to use pointer VARS when it is not associated with a target

Image              PC                Routine            Line        Source             
GEOSgcm.x          00000000004EC98F  gc2gc_mp_mapl_con         259  gc2gc.F90
GEOSgcm.x          0000000000491375  geos_gcmgridcompm         706  GEOS_GcmGridComp.F90