fix(pkg/csv2lp): do not override existing line part in group annotation #19466
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glinton
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Closes #19452
This PR ensures that the #group annotation cannot override the existing line part (measurement, field, tag, time) of a CSV column if it is already set. It also means that all dateTime columns (including _start, _stop from flux query results) cannot become tags with #group annotation, since dateTime columns automatically have time line part.