Merge branch 'error-tracking-sentry-managed-app' into 'master'

Monitor:Health Release Post - Sentry Managed App

See merge request gitlab-com/www-gitlab-com!36495

data/release_posts/unreleased/error-tracking-sentry-managed-app.yml

+features:
+  secondary:
+    - name: 'Add Sentry as a GitLab Managed App'
+      available_in: [core, starter, premium, ultimate]
+      documentation_link: 'https://docs.gitlab.com/ee/user/clusters/applications.html#install-sentry-using-gitlab-ci'
+      reporter: swaldner
+      stage: monitor
+      categories:
+        - 'Error Tracking'
+      issue_url: 'https://gitlab.com/gitlab-org/gitlab/issues/26513'
+      description: |
+        If you're a user of GitLab's Error Tracking features, you value the ability to integrate with Sentry, the most popular open-source error tracking tool. Starting in GitLab 12.6, if you are unable to utilize a Sentry project on Sentry.io, you can deploy Sentry directly to a Kubernetes Cluster attached to your project or group. This will make it much quicker to get started with integrated error tracking in GitLab.
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