### Godot version

4.1

### System information

Windows

### Issue description

Being able to have multiple cursors similarly to vscode is a great feature, however it's only possible to add carets, not remove them. By left clicking you can remove all extra cursors but you cannot remove a specific one so after selecting multiple lines a single missclick, you have to reselect them all again. Looking at the original pr there was a remove_caret function added so it would make sense to be able to remove carets when clicking again, like in vscode.

![image](https://github.com/godotengine/godot/assets/19669673/3867c00e-9faa-4429-9c6d-f2d6d3883044)


### Steps to reproduce

- Alt click to add multiple carets
- Alt click on the same position again
- Nothing happens

### Minimal reproduction project

N/A
LineDrawingCache cache_entry;
				Dictionary color_map = _get_line_syntax_highlighting(line);
				
				Color current_color = !editable ? theme_cache.font_readonly_color : theme_cache.font_color;
				if (draw_placeholder) {
					current_color = theme_cache.font_placeholder_color;
				}
				const Ref<TextParagraph> ldata = draw_placeholder ? placeholder_data_buf : text.get_line_data(line);
				Vector<String> wrap_rows = draw_placeholder ? placeholder_wraped_rows : get_line_wrapped_text(line);
				int line_wrap_amount = draw_placeholder ? placeholder_wraped_rows.size() - 1 : get_line_wrap_count(line);
				for (int line_wrap_index = 0; line_wrap_index <= line_wrap_amount; line_wrap_index++) {
					if (line_wrap_index != 0) {
						i++;
						if (i >= draw_amount) {
							break;
						}
					}
					const String &str = wrap_rows[line_wrap_index];
					int char_margin = xmargin_beg - first_visible_col;
					int ofs_x = 0;
					int ofs_y = 0;
					if (!editable) {
						ofs_x = theme_cache.style_readonly->get_offset().x / 2;
						ofs_x -= theme_cache.style_normal->get_offset().x / 2;
						ofs_y = theme_cache.style_readonly->get_offset().y / 2;
					} else {
						ofs_y = theme_cache.style_normal->get_offset().y / 2;
					}
					ofs_y += i * row_height + theme_cache.line_spacing / 2;
					ofs_y -= first_visible_line_wrap_ofs * row_height;