Add Verify stage metadata to CI docs

...e_request_pipelines/pipelines_for_merged_results/index.md

...elines/pipelines_for_merged_results/merge_trains/index.md

doc/ci/metrics_reports.md

doc/ci/multi_project_pipelines.md

doc/ci/parent_child_pipelines.md

doc/ci/pipelines/index.md

doc/ci/pipelines/job_artifacts.md

doc/ci/pipelines/pipeline_architectures.md

doc/ci/pipelines/schedules.md

doc/ci/pipelines/settings.md

doc/ci/quick_start/README.md

doc/ci/runners/README.md

doc/ci/services/README.md

doc/ci/services/mysql.md

doc/ci/services/postgres.md

doc/ci/services/redis.md

doc/ci/ssh_keys/README.md

doc/ci/triggers/README.md

doc/ci/variables/README.md

doc/ci/variables/deprecated_variables.md