Modern Diag Manager:: Repro fixes

[uramirez8707]

Description

• Add the set_name to the axis object and use it when searching the compress dimension.
  The set name is used to distinguish axis with the same name and it is used in the land code. For example,
  https://gitlab.gfdl.noaa.gov/fms/lm4P/-/blob/2023.02/land_model.F90?ref_type=tags#L3863-3887
• Adds the "associated_files" global attribute to files that need (i.e when the "area" or "volume" variables are not in the file)
  This attribute is needed for PP/fregrid
• If a long_name is not set, use the variable name (instead of out_name) to be consistent with the old diag manager
• Skip diag fields that do not have any data

Fixes # (issue)

How Has This Been Tested?
CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes