Modifies how 15 minute output is processed

[MatthewPyle-NOAA]

Makes changes to generate a single top of the hour "subh" file that has 15 minute output for the preceding hour.

DESCRIPTION OF CHANGES:

• Removes two column integrated condensate fields from subh UPP files, as they no longer are generated by the RRFS.
• Adds a subh_fields.txt field to pull the needed records from the full hourly file.
• Adds logic to post ex-script to concatenate the sub-hourly files into a single "subh" file. This likely will need modification with the coming umbrella directory changes.
• Adds a line in the prdgen ex-script to copy the "subh" file to COMOUT.
• Removes need to run prdgen job for sub-hourly times.

TESTS CONDUCTED:

Machines/Platforms:

• WCOSS2
  • Cactus/Dogwood
  • Acorn
• RDHPCS
  • Hera
  • Jet
  • Orion
  • Hercules

Test cases:

• Engineering tests
  • Non-DA engineering test
  • DA engineering test
    • Retro
    • Ensemble
    • Parallel
• RRFS fire weather
• RRFS_A:
• RRFS_B:
• RTMA:
• Others:

ISSUE:

• Fixes the issue(s) mentioned in create subh products for the top of the hour time, and create aggregated 15 minute products over hour #330

CONTRIBUTORS (optional):