MDTF_postprocessd_data 'standard_name' attribute populated as 'surface_temperature'

[jtmims]

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
During testing, @aradhakrishnanGFDL noticed that all the standard_names found in MDTF_postprocessed_data.csv in the mdtf output directory are populated with 'surface_temperature'. This doesn't appear to cause any POD computation errors, but may very well do so when PODs become more catalog dependent in the near future.