Replace COM Tmpls with environmently set COM values

[TravisElless-NOAA]

It appears there are many yamls in the GDASApp/parm directory utilize COM tmpl's from the global workflow config.com (e.g., in at least snow and marine parm files). The use of these tmpl's has been frowned upon in the global workflow and we have changed to explicit COM declarations in the j-jobs. I suspect this requirement would extend down into the GDASApp as well. Instead of using these tmpl variables, COM paths should use the COMIN/COMOUT variables defined in the global workflow j-jobs. Some marine parm files (e.g., marine_det_config.yaml) looks already to have implemented this. So, this issue probably should be used to make sure this approach is applied consistently across the GDASApp.

[guillaumevernieres]

Could you look into this @AndrewEichmann-NOAA ?

[AndrewEichmann-NOAA]

@TravisElless-NOAA Updating at the suggestion of @CatherineThomas-NOAA : I looked into this and the marine file path templates look straightforward to rewrite as regular paths filled in with the same variables as are used to populate the templates -- there seem to be many examples not just in the snow yamls but also the atmospheric JEDI yamls, which I am less familiar with -- and I would note that the templates are also used elsewhere in global-workflow, such as the archiving.
One difficulty that replacing them is that they are used to create the paths for files produced and used by ensemble members, the directory trees of which start under the cycle hours (eg enkfgdas.20240224/06/mem002) and as such I see no sensible way to assign a typical ensemble of those at the jjob script level. They can be resolved within the jinja yamls where the members are looped through, but at the loss of the single assignment existing currently, and altering the directory tree for the ensemble members in the future would be accordingly tricky and error-prone.
As such I opted to wait for direction from EIB or elsewhere before changing anything, but I think the change can be readily made.

[CatherineThomas-NOAA]

Completed for dev/gfs.v17 via #2183 and NOAA-EMC/global-workflow#5068

This still needs to be updated for develop, but removing from v17 project board.