Do not module reset or load prod_util when running ecflow

[DavidHuber-NOAA]

Description

When running ecflow, loading prod_util causes issues with the suite (it should only be loaded in the ecf scripts). Similarly, modules should not be reset when running ecflow cases as this will cause prod_util to be unloaded.

Resolves #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
  • GDASApp

How has this been tested?

@lgannoaa is testing this change presently.
I also verified that setting ECF_JOB and then loading the modules prevented prod_util from loading.

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 documented my code, including function, input, and output descriptions
• My changes generate no new warnings
• New and existing tests pass with my changes

[DavidHuber-NOAA]

This PR requires a GDASApp update, hence the needs submodule update label. Once the GDASApp PR is open, I will open this PR for review.

[DavidHuber-NOAA]

@lgannoaa did this work successfully for you?