Enhancement: Follow symbolic links when searching for files within a time window

The logic that traverses a directory to find files that fall within a time window (FILE_WINDOW) does not follow symbolic links, so directories that contain links will not be traversed. This came up in discussion #2415

Describe the Enhancement

The call to os.walk in the _get_closest_files function in metplus/wrappers/command_builder.py should include the argument followlinks=True

Time Estimate

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Sub-Issues

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Relevant Deadlines

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Define Related Issue(s)

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[ ] METplus, MET, METdataio, METviewer, METexpress, METcalcpy, METplotpy

Enhancement Checklist

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[ ] Complete the issue definition above, including the Time Estimate and Funding Source.
[ ] Fork this repository or create a branch of develop. Branch name: feature_<Issue Number>_<Description>
[ ] Complete the development and test your changes.
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[ ] Add any new Python packages to the METplus Components Python Requirements table.
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dtcenter / METplus