Add latest changes from gitlab-org/gitlab@12-7-stable-ee

changelogs/unreleased/prevent-job-logs-line-number-from-being-selected.yml

----
-title: Prevent job log line numbers from being selected
-merge_request: 22691
-author:
-type: fixed

changelogs/unreleased/refactor-expose-missing-mention-disabled-group-api.yml

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-title: Expose mentions_disabled value via group API
-merge_request: 23070
-author: Fabio Huser
-type: added

changelogs/unreleased/refactor-session-disable-with-post.yml

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-title: User signout and admin mode disable use now POST instead of GET
-merge_request: 22113
-author: Diego Louzán
-type: other

changelogs/unreleased/remove-ancestor-flag.yml

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-title: Remove N+1 query issue when checking group root ancestor.
-merge_request:
-author:
-type: performance

changelogs/unreleased/remove-deployment-feature-flags.yml

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-title: Track deployed merge requests using GitLab environments and deployments
-merge_request:
-author:
-type: added

changelogs/unreleased/remove-feature-flag-import-graceful-failures.yml

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-title: Remove feature flag for import graceful failures
-merge_request:
-author:
-type: other

changelogs/unreleased/remove-note-after-initialize.yml

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-title: Remove after_initialize and before_validation for Note
-merge_request: 22128
-author:
-type: performance

changelogs/unreleased/remove-pg-limit-fix.yml

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-title: Remove ActiveRecord patch to ignore limit on text columns
-merge_request: 22406
-author:
-type: other

changelogs/unreleased/remove-unused-project-import-state-index.yml

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-title: Remove unused index on project_mirror_data
-merge_request: 22647
-author:
-type: performance

changelogs/unreleased/remove_enable_cluster_application_crossplane_flag.yml

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-title: Enable ability to install Crossplane app by default
-merge_request: 22141
-author:
-type: changed

changelogs/unreleased/remove_milestone_id_from_epics2.yml

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-title: Remove milestone_id from epics
-merge_request: 20539
-author: Lee Tickett
-type: other

changelogs/unreleased/return-empty-body-for-204-responses-in-api.yml

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-title: Return empty body for 204 responses in API
-merge_request: 22086
-author:
-type: fixed

changelogs/unreleased/return_slug_in_api_services_index.yml

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-title: Add slug to services API response
-merge_request: 22518
-author:
-type: added

changelogs/unreleased/revert-knative-version-prerequisite.yml

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-title: Reverts Add RBAC permissions for getting knative version
-merge_request: 22560
-author:
-type: fixed

changelogs/unreleased/rk-118664-upgrade-monaco-editor.yml

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-title: Updated monaco-editor dependency
-merge_request: 21938
-author:
-type: other

changelogs/unreleased/ruby-2-6-5-source.yml

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-title: Update Ruby to 2.6.5
-merge_request: 22417
-author:
-type: other

changelogs/unreleased/runner-referees.yml

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-title: Metrics and network referee artifact types added to job artifact types
-merge_request: 20181
-author:
-type: added

changelogs/unreleased/sample-metrics-from-ui.yml

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-title: Backend for allowing sample metrics to be toggled from ui
-merge_request: 22901
-author:
-type: added

changelogs/unreleased/sample-metrics-without-prometheus.yml

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-title: Show sample metrics for an environment without prometheus configured
-merge_request: 22133
-author:
-type: added

changelogs/unreleased/sh-add-pipeline-index.yml

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-title: Add index to optimize loading pipeline charts
-merge_request: 22052
-author:
-type: performance