Duplicate titleRow variable and convert to $titleRow since it is a jQuery object

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Rerolled for D10

If we care about this, shouldn't there be a linting rule made for this? Or is it not possible to track these down? Or should we use this to try and move away from jQuery and not changing the variable name and changing the use of jQuery to vanilla-js per 🌱 [meta] Replace JQuery with vanilla Javascript in core Active ?

Anyway, there are more of these floating around this file. If we are changing this let's at least change all of them in this file and not just one or two variables

Quick scan:

        titleRow = $('tr#views-group-title-2');
        newRow = $(
          '<tr class="filter-group-operator-row"><td colspan="5"></td></tr>',
        );

const groupField = $(
            'select.views-group-select',
            this.rowObject.element,
          );

const rows = $(this.table).find('tr');

might be more....