### 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
}
									if (rtl) {
										gutter_rect.position.x = size.width - gutter_rect.position.x - gutter_rect.size.x;
									}
									icon->draw_rect(ci, gutter_rect, false, get_line_gutter_item_color(line, g));
								} break;
								case GUTTER_TYPE_CUSTOM: {
									if (gutter.custom_draw_callback.is_valid()) {
										Rect2i gutter_rect = Rect2i(Point2i(gutter_offset, ofs_y), Size2i(gutter.width, row_height));
										if (rtl) {
											gutter_rect.position.x = size.width - gutter_rect.position.x - gutter_rect.size.x;
										}
										Variant args[3] = { line, g, Rect2(gutter_rect) };
										const Variant *argp[] = { &args[0], &args[1], &args[2] };
										Callable::CallError ce;
										Variant ret;
										gutter.custom_draw_callback.callp(argp, 3, ret, ce);
									}
								} break;
							}
							gutter_offset += gutter.width;
						}
					}
					
					RID rid = ldata->get_line_rid(line_wrap_index);
					float text_height = TS->shaped_text_get_size(rid).y;
					if (rtl) {
						char_margin = size.width - char_margin - TS->shaped_text_get_size(rid).x;
					}
					for (int c = 0; c < carets.size(); c++) {