### 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
for (int i = 0; i < carets.size(); i++) {
		if (p_caret != -1 && p_caret != i) {
			continue;
		}
		if (!has_selection(i)) {
			continue;
		}
		Point2i pos = get_line_column_at_pos(get_local_mouse_pos());
		int row = pos.y;
		int col = pos.x;
		if (p_edges) {
			if ((row == get_selection_from_line(i) && col == get_selection_from_column(i)) || (row == get_selection_to_line(i) && col == get_selection_to_column(i))) {
				return true;
			}
		}
		if (row >= get_selection_from_line(i) && row <= get_selection_to_line(i) && (row > get_selection_from_line(i) || col > get_selection_from_column(i)) && (row < get_selection_to_line(i) || col < get_selection_to_column(i))) {
			return true;
		}
	}
	return false;
}
void TextEdit::set_caret_type(CaretType p_type) {
	if (caret_type == p_type) {
		return;
	}
	caret_type = p_type;
	queue_redraw();
}
TextEdit::CaretType TextEdit::get_caret_type() const {