[ML] Fix for delimited data with whitespace in fields (#24899)

* [ML] Fix for delimted data with whitespace in fields

* rewriting to use papaparse transform function

x-pack/plugins/ml/public/file_datavisualizer/components/import_view/importer/csv_importer.js

@@ -17,15 +17,18 @@ export class CsvImporter extends Importer {
     this.quote = results.quote;
     this.hasHeaderRow = results.has_header_row;
     this.columnNames = results.column_names;
+    this.shouldTrimFields = (results.should_trim_fields || false);
   }
 
   async read(csv) {
     try {
+      const transform = this.shouldTrimFields ? (f => f.trim()) : (f => f);
       const config = {
         header: false,
         skipEmptyLines: 'greedy',
         delimiter: this.delimiter,
         quoteChar: this.quote,
+        transform,
       };
 
       const parserOutput = Papa.parse(csv, config);