Docs: Added metadata for Release, Package

Related to: https://gitlab.com/gitlab-org/gitlab/-/issues/216290

doc/administration/packages/container_registry.md

+---
+stage: Package
+group: Package
+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
+---
+
 # GitLab Container Registry administration
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/4040) in GitLab 8.8.

doc/administration/packages/dependency_proxy.md

+---
+stage: Package
+group: Package
+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
+---
+
 # GitLab Dependency Proxy administration **(PREMIUM ONLY)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/7934) in [GitLab Premium](https://about.gitlab.com/pricing/) 11.11.

doc/administration/packages/index.md

+---
+stage: Package
+group: Package
+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
+---
+
 # GitLab Package Registry administration **(PREMIUM ONLY)**
 
 GitLab Packages allows organizations to utilize GitLab as a private repository

doc/administration/pages/index.md

 ---
+stage: Release
+group: Release Management
+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
 description: 'Learn how to administer GitLab Pages.'
 ---
 

doc/administration/pages/source.md

+---
+stage: Release
+group: Release Management
+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
+---
+
 # GitLab Pages administration for source installations
 
 >**Note:**