### 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
carets.write[p_caret].selection.active = false;
		} else if (get_selection_from_column(p_caret) > get_selection_to_column(p_caret)) {
			carets.write[p_caret].selection.shiftclick_left = false;
			SWAP(carets.write[p_caret].selection.from_column, carets.write[p_caret].selection.to_column);
		} else {
			carets.write[p_caret].selection.shiftclick_left = true;
		}
	} else if (get_selection_from_line(p_caret) > get_selection_to_line(p_caret)) {
		carets.write[p_caret].selection.shiftclick_left = false;
		SWAP(carets.write[p_caret].selection.from_line, carets.write[p_caret].selection.to_line);
		SWAP(carets.write[p_caret].selection.from_column, carets.write[p_caret].selection.to_column);
	} else {
		carets.write[p_caret].selection.shiftclick_left = true;
	}
	caret_index_edit_dirty = true;
	queue_redraw();
}
bool TextEdit::has_selection(int p_caret) const {
	ERR_FAIL_COND_V(p_caret > carets.size(), false);
	for (int i = 0; i < carets.size(); i++) {
		if (p_caret != -1 && p_caret != i) {
			continue;
		}
		if (carets[i].selection.active) {
			return true;
		}
	}
	return false;
}
String TextEdit::get_selected_text(int p_caret) {