### 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 (!editable) {
		return;
	}
	begin_complex_operation();
	Vector<int> caret_edit_order = get_caret_index_edit_order();
	for (const int &i : caret_edit_order) {
		bool first_line = false;
		if (!p_split_current_line) {
			deselect(i);
			if (p_above) {
				if (get_caret_line(i) > 0) {
					set_caret_line(get_caret_line(i) - 1, false, true, 0, i);
					set_caret_column(text[get_caret_line(i)].length(), i == 0, i);
				} else {
					set_caret_column(0, i == 0, i);
					first_line = true;
				}
			} else {
				set_caret_column(text[get_caret_line(i)].length(), i == 0, i);
			}
		}
		insert_text_at_caret("\n", i);
		if (first_line) {
			set_caret_line(0, i == 0, true, 0, i);
		}
	}
	end_complex_operation();
}
void TextEdit::_move_caret_left(bool p_select, bool p_move_by_word) {