Add docs metadata for SAST and DAST

doc/user/application_security/dast/index.md

 ---
+stage: Secure
+group: Dynamic Analysis
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference, howto
 ---
 

doc/user/application_security/sast/analyzers.md

+---
+stage: Secure
+group: Static Analysis
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
+---
+
 # SAST Analyzers **(ULTIMATE)**
 
 SAST relies on underlying third party tools that are wrapped into what we call

doc/user/application_security/sast/index.md

 ---
+stage: Secure
+group: Static Analysis
+info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#designated-technical-writers
 type: reference, howto
 ---