Add Configure stage / group metadata

Indicate that these pages are owned by the Configure stage.

doc/user/clusters/applications.md

+---
+stage: Configure
+group: Configure
+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 Managed Apps
 
 GitLab provides **GitLab Managed Apps**, a one-click install for various applications which can

doc/user/clusters/crossplane.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Crossplane configuration
 
 Once Crossplane [is installed](applications.md#crossplane), it must be configured for

doc/user/clusters/environments.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Cluster Environments **(PREMIUM)**
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/13392) for group-level clusters in [GitLab Premium](https://about.gitlab.com/pricing/) 12.3.

doc/user/clusters/management_project.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Cluster management project (alpha)
 
 CAUTION: **Warning:**

doc/user/group/clusters/index.md

 ---
 type: reference
+stage: Configure
+group: Configure
+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
 ---
 
 # Group-level Kubernetes clusters

doc/user/infrastructure/index.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Infrastructure as code with GitLab managed Terraform State
 
 [Terraform remote backends](https://www.terraform.io/docs/backends/index.html)

doc/user/project/clusters/add_eks_clusters.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Adding EKS clusters
 
 GitLab supports adding new and existing EKS clusters.

doc/user/project/clusters/add_gke_clusters.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Adding GKE clusters
 
 GitLab supports adding new and existing GKE clusters.

doc/user/project/clusters/add_remove_clusters.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Adding and removing Kubernetes clusters
 
 GitLab offers integrated cluster creation for the following Kubernetes providers:

doc/user/project/clusters/kubernetes_pod_logs.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Kubernetes Logs
 
 > - [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/4752) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 11.0.

doc/user/project/clusters/runbooks/index.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Runbooks
 
 Runbooks are a collection of documented procedures that explain how to

doc/user/project/clusters/serverless/aws.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Deploying AWS Lambda function using GitLab CI/CD
 
 GitLab allows users to easily deploy AWS Lambda functions and create rich serverless applications.

doc/user/project/clusters/serverless/index.md

+---
+stage: Configure
+group: Configure
+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
+---
+
 # Serverless
 
 > Introduced in GitLab 11.5.