### 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
delete_selection(p_caret);
		cut_copy_line = "";
		return;
	}
	begin_complex_operation();
	Vector<int> carets_to_remove;
	StringBuilder clipboard;
	
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (int i = caret_edit_order.size() - 1; i >= 0; i--) {
		int caret_idx = caret_edit_order[i];
		if (p_caret != -1 && p_caret != caret_idx) {
			continue;
		}
		int cl = get_caret_line(caret_idx);
		int cc = get_caret_column(caret_idx);
		int indent_level = get_indent_level(cl);
		double hscroll = get_h_scroll();
		
		
		for (int j = i - 1; j >= 0; j--) {
			if (get_caret_line(caret_edit_order[j]) == cl) {
				carets_to_remove.push_back(caret_edit_order[j]);
				i = j;
			}
		}
		clipboard += text[cl];
		if (p_caret == -1 && caret_idx != 0) {
			clipboard += "\n";
		}