### 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 (cl == 0 && get_line_count() > 1) {
			_remove_text(cl, 0, cl + 1, 0);
			adjust_carets_after_edit(caret_idx, cl, 0, cl + 1, text[cl].length());
		} else {
			_remove_text(cl, 0, cl, text[cl].length());
			set_caret_column(0, false, caret_idx);
			backspace(caret_idx);
			set_caret_line(get_caret_line(caret_idx) + 1, caret_idx == 0, 0, 0, caret_idx);
		}
		
		int diff_indent = indent_level - get_indent_level(get_caret_line(caret_idx));
		cc += diff_indent;
		if (diff_indent != 0) {
			cc += diff_indent > 0 ? -1 : 1;
		}
		
		set_h_scroll(hscroll);
		set_caret_column(cc, caret_idx == 0, caret_idx);
	}
	
	carets_to_remove.sort();
	for (int i = carets_to_remove.size() - 1; i >= 0; i--) {
		remove_caret(carets_to_remove[i]);
	}
	end_complex_operation();
	String clipboard_string = clipboard.as_string();
	DisplayServer::get_singleton()->clipboard_set(clipboard_string);
	cut_copy_line = clipboard_string;
}
void TextEdit::_copy_internal(int p_caret) {