Update 4 files

• /tests/modules/flag_link_test/flag_link_test.routing.yml
• /tests/modules/flag_link_test/flag_link_test.info.yml
• /tests/modules/flag_link_test/src/Controller/FlagLinkTest.php
• /tests/src/Functional/AjaxLinkNoJsTest.php

Closes #3292206