Step 2: Security tab introduction
See design issue for complete MVC definition: https://gitlab.com/gitlab-org/gitlab/-/issues/12896/
* Create security tab with vulnerability list.
* Rename and reroute "expand/collapse" button to "view results".
* Route the action to the security tab.
* Move DAST URL scan count to filter section of security tab.
https://gitlab.com/gitlab-org/gitlab/-/issues/12896/designs/z-Step_2.png

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