Possible follow-up of 29957

Something like:

=head2 clear_session_and_cookies

    ( $session, $sessionID, $cookie ) = clear_session_and_cookies( $session, $sessionID, $cookie, $mgr, $cgi );

=cut

sub clear_session_and_cookies {
    my ( $session, $sessionID, $cookie, $mgr, $cgi ) = @_;
    $mgr //= Koha::CookieManager->new;

    $session->delete;
    $session->flush;
    my @list = ref($cgi) eq 'CGI' ? $cgi->cookie : ();
    push @list, @$cookie if ref($cookie) eq 'ARRAY';
    $cookie = $cookie_mgr->clear_unless( @list );
    C4::Context::_unset_userenv($sessionID);

    return ( undef, undef, $cookie );
}