[pgAdmin][RM4552] Dragging the selected text in SQL editor throwsconsole errors

Hi Hackers,

Attached is the patch to fix the issue where dragging a selected text in SQL editor throws console errors and does not move the text.

As an improvement, the patch also fixes a potential issue where importing jquery.event.drag will override drag events and will break drag and drop feature. Currently jquery.event.drag is not imported. Changes are made to use vanilla addEventListener instead of jquery on() to attach drag related events to avoid conflict.

Kindly review.