Do not load prod_util or run module reset when running ecflow

[DavidHuber-NOAA]

Description

When running an ecflow suite, some modules need to be loaded in the ecf scripts and never unloaded (including prod_util). This change this change works to prevent either of these from happening.

Refs #4599

Type of change

• Bug fix (fixes something broken)
• New feature (adds functionality)
• Maintenance (code refactor, clean-up, new CI test, etc.)

Change characteristics

• Is this change expected to change outputs NO
• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO
• Does this change require an update to any of the following submodules? YES
  • GDAS

How has this been tested?

Loaded modules on WCOSS2 with and without ECF_JOB defined. Lin will be testing this in a parallel.

Checklist

• Any dependent changes have been merged and published
• 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
• My changes generate no new warnings
• New and existing tests pass with my changes