First iteration of the Insights feature documentation

Closes #9995

See merge request gitlab-org/gitlab-ee!10282

EE port of " Allow external diffs to be used conditionally "

See merge request gitlab-org/gitlab-ee!9850

[EE] Upgrade `gitlab-markup` to 1.7.0

See merge request gitlab-org/gitlab-ee!10390

Fix Auto DevOps missing domain error handling

Closes #59546

See merge request gitlab-org/gitlab-ce!26627

Design management detail

See merge request gitlab-org/gitlab-ee!10299

Allow personal access token env var from gitlab-qa

See merge request gitlab-org/gitlab-ce!24048

gitlab-qa accepts an env var named GITLAB_QA_ACCESS_TOKEN, but here we
only accepted PERSONAL_ACCESS_TOKEN.

This change replaces PERSONAL_ACCESS_TOKEN with GITLAB_QA_ACCESS_TOKEN

Properly handle `ee` migration specs

See merge request gitlab-org/gitlab-ce!26685

[CE] Reduce diff with EE in `spec/policies`

See merge request gitlab-org/gitlab-ce!26593

[EE] Reduce diff with CE in `spec/policies`

See merge request gitlab-org/gitlab-ee!10425

Fix install link in Elasticsearch integraton docs

Closes #10739

See merge request gitlab-org/gitlab-ee!10464

Docs: Fix another anchor

See merge request gitlab-org/gitlab-ee!10441

For some reason this value can be an empty string and we want to ensure
that we correctly fail the job before a deploy. This is particularly
problematic at the moment when coupled with
https://gitlab.com/gitlab-org/gitlab-ce/issues/54760 as the user has no
easy way to recover without destroying the cluster and starting over.

Update U2F recommendations, fix #57656

Closes #57656

See merge request gitlab-org/gitlab-ce!25709

Rename build to job in webhooks docs

Closes #42254 and #28226

See merge request gitlab-org/gitlab-ce!26676

Revert "Merge branch '13784-validate-variables-for-masking' into 'master'"

Closes gitlab-ee#10740 and gitlab-ee#10738

See merge request gitlab-org/gitlab-ce!26684

This reverts merge request !25476

Upgraded Vue to 2.6.10 and also Vuex to 3.1.0

See merge request gitlab-org/gitlab-ce!25981

Upgrade to latest Version

Upgraded Vue to 2.6.10 and also Vuex to 3.1.0

See merge request gitlab-org/gitlab-ee!10372

Updated Vue + Vuex fix to all spec failures

Log Gitaly RPC duration to api_json.log and production_json.log

See merge request gitlab-org/gitlab-ce!26652

Geo: Persist OAuth callback changes for Alternate URL

See merge request gitlab-org/gitlab-ee!10358

Add control for masking variable values in runner logs

Closes #13784

See merge request gitlab-org/gitlab-ce!25476

Add a masked switch to variable rows
Copy some behavior from the protected switch