Write the analysis into the mpasinout file instead of a separate ana file

[guoqing-noaa]

This is to document how to write out the final analysis into the mpasinout file instead of a separate analysis file. No PRs are needed at the moment.

An example based on the rrfs_mpasjedi_2024052700_Ens3Dvar.yaml file:

1. Make a hardened copy of the mpasout file as mapsinout
cp -L data/mpasout.2024-05-27_00.00.00.nc mpasinout.2024-05-27_00.00.00.nc

2. Modify rrfs_mpasjedi_2024052700_Ens3Dvar.yaml
filename: ./ana.$Y-$M-$D_$h.$m.$s.nc
   to
   mpasinout.$Y-$M-$D_$h.$m.$s.nc

And now the MPASJEDI analysis will be written into the mpasinout file, which can initialize the next cycle forecast
I have a demo run at: /scratch1/BMC/wrfruc/gge/RDASApp/expr/mpas_2024052700_mpasinout