Add Verify stage metadata to CI docs

doc/ci/examples/authenticating-with-hashicorp-vault/index.md

doc/ci/examples/deploy_spring_boot_to_cloud_foundry/index.md

doc/ci/examples/deployment/README.md

doc/ci/examples/deployment/composer-npm-deploy.md

...i/examples/devops_and_game_dev_with_gitlab_ci_cd/index.md

doc/ci/examples/end_to_end_testing_webdriverio/index.md

doc/ci/examples/laravel_with_gitlab_and_envoy/index.md

doc/ci/examples/php.md

.../examples/test-and-deploy-python-application-to-heroku.md

...ci/examples/test-and-deploy-ruby-application-to-heroku.md

doc/ci/examples/test-clojure-application.md

doc/ci/examples/test-scala-application.md

doc/ci/examples/test_phoenix_app_with_gitlab_ci_cd/index.md

doc/ci/git_submodules.md

doc/ci/interactive_web_terminal/index.md

doc/ci/introduction/index.md

doc/ci/jenkins/index.md

doc/ci/junit_test_reports.md

doc/ci/large_repositories/index.md

doc/ci/merge_request_pipelines/index.md