### 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
ERR_FAIL_INDEX_V(p_line, text.size(), 0);
	int col = 0;
	while (col < text[p_line].length() && is_whitespace(text[p_line][col])) {
		col++;
	}
	return col;
}
void TextEdit::swap_lines(int p_from_line, int p_to_line) {
	ERR_FAIL_INDEX(p_from_line, text.size());
	ERR_FAIL_INDEX(p_to_line, text.size());
	String tmp = get_line(p_from_line);
	String tmp2 = get_line(p_to_line);
	begin_complex_operation();
	set_line(p_to_line, tmp);
	set_line(p_from_line, tmp2);
	end_complex_operation();
}
void TextEdit::insert_line_at(int p_at, const String &p_text) {