[develop] fix: update AQM data paths to avoid user directory

[benkozi]

DESCRIPTION OF CHANGES:

• Remove dependency on user paths for AQM-related data files.
• Moves location of fix_emis on Derecho.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

TESTS CONDUCTED:

Note: Derecho is unstable with the SRW, and I have been unable to run a full workflow.

• derecho.intel
• gaeac6.intel
• hera.gnu
• hera.intel
• hercules.intel
• orion.intel
• ursa.gnu
• ursa.intel
• NOAA Cloud (indicate which platform)
• Jenkins
• fundamental test suite
• comprehensive tests (specify which if a subset was used)

DEPENDENCIES:

DOCUMENTATION:

ISSUE:

CHECKLIST

• My code follows the style guidelines in the Contributor's Guide
• I have performed a self-review of my own code using the Code Reviewer's Guide
• I have commented my code, particularly in hard-to-understand areas
• My changes need updates to the documentation. I have made corresponding changes to the documentation
• My changes do not require updates to the documentation (explain).
• My changes generate no new warnings
• New and existing tests pass with my changes
• Any dependent changes have been merged and published

LABELS (optional):

A Code Manager needs to add the following labels to this PR:

• Work In Progress
• bug
• enhancement
• documentation
• release
• high priority
• run_ci
• run_we2e_fundamental_tests
• run_we2e_comprehensive_tests
• help wanted

CONTRIBUTORS (optional):

@selbigmtnwx23 (data staging)

[MichaelLueken]

The AQM WE2E test successfully completed on Derecho:

----------------------------------------------------------------------------------------------------
Experiment name                                                  | Status    | Core hours used 
----------------------------------------------------------------------------------------------------
aqm_grid_AQM_NA13km_suite_GFS_v16_20260105121950                   COMPLETE            4078.39
----------------------------------------------------------------------------------------------------
Total                                                              COMPLETE            4078.39

Since this PR is related to just the AQM on Derecho, I will approve this PR and merge it now.

[MichaelLueken]

@benkozi -

Given that the AQM WE2E test successfully ran on Derecho, I will approve this PR and merge it now.