test mixed layer depth with fre_om5 output failed

[33de6maggie]

Bug Severity

• 1 = Minor problem that does not affect total framework functionality (e.g., computation error in a POD, problem with logging output, or an issue on a single system
• 2 = Major problem that affects overall functionality, but that does not occur for all users (e.g., problems installing the framework with a specific Conda version, a framework option that causes one or more PODs to fail, or missing/incompatible Python modules).
• [√ ] 3 = Catastrophic problem that occurs frequently for multiple users and/or on multiple systems (e.g.,framework consistently fails to install on multiple systems, or one or more PODs continuously fails after running successfully)

Describe the bug
When testing this POD with fre_om5 output (/archive/Alistair.Adcroft/fre_om5/FMS2023.02_om5_20230926/cm_am4c96l33_b02/gfdl.ncrc5-intel23-prod-openmp/pp/), data request for <thetao.mon> failed due to variable name translation: "Standard name 'sea_water_potential_temperature' not defined in convention 'GFDL'.".") and also failed to find alternate data.

It also mentioned that ERROR: Deactivated <#KNBZ:FMS112023_MLDSI> due to ChildFailureEvent("Deactivating <#KNBZ:FMS112023_MLDSI> due to failure of all child objects.").

Steps To Reproduce
I am using the updated version and ran the pod interactively using the following command: './my_gfdl -f sites/NOAA_GFDL/default_gfdl.jsonc --site NOAA_GFDL -v' under '/archive/x4l/mdtf_112023v2/MDTF-diagnostics'

Environment
Describe the system environment:

• OS: [e.g. RHEL 7.2]
• Conda version: [the conda info command will provide the installation information]
• branch name and link: [e.g., develop, https://github.com/NOAA-GFDL/MDTF-diagnostics/tree/develop]

Log information and/or terminal output
(file:///archive/x4l/MDTF-GFDL/wkdir/MDTF_FMS112023_MLDSI_1_60/FMS112023_MLDSI.log)