Hotfix: Allow symbolic link to run_metplus.py to run

[georgemccabe]

by getting the real path of the script before trying to find the directory above the script to import metplus and produtil

Pull Request Testing

• [X] Describe testing already performed for these changes:
  

Created sym link to run_metplus.py in another directory and confirmed that it failed using develop (cannot import produtil). Confirmed that it works with the fix.

• [X] Recommend testing for the reviewer(s) to perform, including the location of input datasets, and any additional instructions:
  

Confirm that this fix resolved the issue you experienced. Ensure that all automated tests pass

• [X] Do these changes include sufficient documentation updates, ensuring that no errors or warnings exist in the build of the documentation? [Yes ]

• [X] Do these changes include sufficient testing updates? [Yes]

We could consider adding a test that creates a sym link to run_metplus.py and tries to call it from there.

• [X] Will this PR result in changes to the test suite? [No]
  

There are diffs from a previous change that will likely flag diffs in this PR, but they can be resolved once the truth data is updated.

• [X] Please complete this pull request review by 2/16/2024.
  

Pull Request Checklist

See the METplus Workflow for details.

• [ ] Add any new Python packages to the METplus Components Python Requirements table.
• [ ] Review the source issue metadata (required labels, projects, and milestone).
• [ ] Complete the PR definition above.
• [ ] Ensure the PR title matches the feature or bugfix branch name.
• [ ] Define the PR metadata, as permissions allow. Select: Reviewer(s) Select: Organization level software support Project or Repository level development cycle Project Select: Milestone as the version that will include these changes
• [ ] After submitting the PR, select the :gear: icon in the Development section of the right hand sidebar. Search for the issue that this PR will close and select it, if it is not already selected.
• [ ] After the PR is approved, merge your changes. If permissions do not allow this, request that the reviewer do the merge.
• [ ] Close the linked issue and delete your feature or bugfix branch from GitHub.

[coveralls]

Pull Request Test Coverage Report for Build 7920728047

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 90.986%

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Totals
Change from base Build 7837387956:	0.0%
Covered Lines:	8590
Relevant Lines:	9441

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💛 - Coveralls