Remove HIRS from GSI regression tests

[ADCollard]

Description

With the update to CRTM 2.4.0.1, an issue with versioning of CRTM HIRS files has been exposed. This is documented in JCSDA/spack-stack#922 and JCSDA/crtm#42.

As HIRS radiances are no longer used in the GSI, these data should be removed from the regression tests until a suitable update to CRTM is available.

Resolves #2182

Type of change

• Bug fix (fixes something broken)

Change characteristics

• Is this a breaking change (a change in existing functionality)? YES - HIRS will no longer be processed, but results do not change as the data were passive.
• Does this change require a documentation update? NO

How has this been tested?

Clone and build on Hera.

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
• I have made corresponding changes to the documentation if necessary