Docs: Added metadata for Package

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

doc/user/packages/conan_repository/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 Conan Repository **(PREMIUM)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/8248) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.6.

doc/user/packages/container_registry/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 Container Registry
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/4040) in GitLab 8.8.

doc/user/packages/dependency_proxy/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
+---
+
 # Dependency Proxy **(PREMIUM ONLY)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/7934) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.11.

doc/user/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
 
 GitLab Packages allows organizations to utilize GitLab as a private repository

doc/user/packages/maven_repository/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 Maven Repository **(PREMIUM)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/5811) in [GitLab Premium](https://about.gitlab.com/pricing/) 11.3.

doc/user/packages/npm_registry/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 NPM Registry **(PREMIUM)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/5934) in [GitLab Premium](https://about.gitlab.com/pricing/) 11.7.

doc/user/packages/nuget_repository/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 NuGet Repository **(PREMIUM)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/20050) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.8.

doc/user/packages/pypi_repository/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 PyPi Repository **(PREMIUM)**
 
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/208747) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.10.