Feature #3033 MTD header columns

[JohnHalleyGotway]

Expected Differences

Note that is PR is related to MET #3033 for which the header table was updated with MTD column information. This was an email request from @randytpierce that I was able to include in the main_v12.0 branch prior to the MET-12.0.0 release. This PR is to add the MTD header columns to the develop branch for inclusion in the next release, MET-12.1.0.

• Do these changes introduce new tools, command line arguments, or configuration file options? [No]
  
  If yes, please describe:
  

• Do these changes modify the structure of existing or add new output data types (e.g. statistic line types or NetCDF variables)? [No]
  
  If yes, please describe:
  

Pull Request Testing

• Describe testing already performed for these changes:
  
  None.

• Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  
  Review the modifications, looking for typos, and confirm that all GHA tests run with no differences flagged.

• Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [No]
  None needed.

• Do these changes include sufficient testing updates? [No]
  None needed.

• Will this PR result in changes to the MET test suite? [No]
  
  If yes, describe the new output and/or changes to the existing output:
  

• Will this PR result in changes to existing METplus Use Cases? [No]
  
  If yes, create a new Update Truth METplus issue to describe them.

• Do these changes introduce new SonarQube findings? [No]
  
  If yes, please describe:

• Please complete this pull request review by [Fri 12/20/24].
  

Pull Request Checklist

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