[FIX] Update import from csv-parse (#25872)

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This PR updates the importing of `csv-parse` because the used method wasn't working anymore, we were receiving the following error:

`error: "this.csvParser is not a function"`

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## Issue(s)
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apps/meteor/app/importer-csv/server/importer.js

@@ -7,7 +7,9 @@ export class CsvImporter extends Base {
 	constructor(info, importRecord) {
 		super(info, importRecord);
 
-		this.csvParser = require('csv-parse/lib/sync');
+		const { parse } = require('csv-parse/lib/sync');
+
+		this.csvParser = parse;
 	}
 
 	prepareUsingLocalFile(fullFilePath) {

apps/meteor/app/importer-slack-users/server/importer.js

@@ -11,7 +11,9 @@ export class SlackUsersImporter extends Base {
 	constructor(info, importRecord) {
 		super(info, importRecord);
 
-		this.csvParser = require('csv-parse/lib/sync');
+		const { parse } = require('csv-parse/lib/sync');
+
+		this.csvParser = parse;
 		this.userMap = new Map();
 		this.admins = []; // Array of ids of the users which are admins
 	}