Remove old-style PHP-templates

modules/core/templates/authsource_list.tpl.php

modules/core/templates/cardinality_error.tpl.php

modules/core/templates/frontpage_auth.tpl.php

modules/core/templates/frontpage_config.tpl.php

modules/core/templates/frontpage_federation.tpl.php

modules/core/templates/frontpage_welcome.tpl.php

modules/core/templates/loginuserpass.tpl.php

modules/core/templates/logout-iframe-wrapper.tpl.php

modules/core/templates/logout-iframe.tpl.php

modules/core/templates/no_cookie.tpl.php

modules/core/templates/no_metadata.tpl.php

modules/core/templates/no_state.tpl.php

modules/core/templates/short_sso_interval.tpl.php

modules/core/templates/show_metadata.tpl.php

modules/cron/templates/croninfo-result.tpl.php

modules/cron/templates/croninfo.tpl.php

modules/multiauth/templates/selectsource.tpl.php

modules/saml/templates/proxy/invalid_session.tpl.php

modules/saml/templates/sp/wrong_authncontextclassref.tpl.php

psalm.xml