Show header and footer system messages in email

Closes #56863

See merge request gitlab-org/gitlab-ce!25474

Port CE 56863-system-messages-in-email to EE

See merge request gitlab-org/gitlab-ee!9689

Add docs for EE components in CE components

See merge request gitlab-org/gitlab-ce!25649

Upgrade jest and related dependencies

Closes #54834

See merge request gitlab-org/gitlab-ce!25597

Move EE differences out of CE diff files

Closes #9959 and #10001

See merge request gitlab-org/gitlab-ee!9762

CE port of noteable-discussion-ee-differences

See merge request gitlab-org/gitlab-ce!25638

Update best_practices.md let section to also reference let! variables.

See merge request gitlab-org/gitlab-ce!22496

Add dedicated group relation to user & group classes

See merge request gitlab-org/gitlab-ee!9663

Revert "Quarantine GitHub OAuth test"

Closes gitlab-org/quality/nightly#83

See merge request gitlab-org/gitlab-ce!25636

This removes other outdated babel@6 dependencies as well.

Unfortunately the newer version of vue-jest has a dependency of an older
version of ts-jest. In order to satisfy the peerDependency from ts-jest,
we are forcing the version@24. The only "breaking" change from ts-jest
23->24 is that it requires a newer version of jest. This might be
obsolete soon, as vue-jest plans on switching to babel eventually.

Moved batch comments code out of CE files as much as possible
Made DraftNote component an async import
The async import will resolve to an empty component in CE

Closes https://gitlab.com/gitlab-org/gitlab-ee/issues/10001 https://gitlab.com/gitlab-org/gitlab-ee/issues/9959

Use Web IDE path for merge request edit buttons

See merge request gitlab-org/gitlab-ce!25595

Fix bug where project topics truncate

Closes #57788

See merge request gitlab-org/gitlab-ce!25398

Enabling performance metrics on Review Apps

Closes #57881

See merge request gitlab-org/gitlab-ce!25549

This reverts commit 970576c5.

Update apollo libraries

See merge request gitlab-org/gitlab-ce!25608

Reorganize admin views a bit

See merge request gitlab-org/gitlab-ee!9721

Backport: Add project level config for merge pipelines

See merge request gitlab-org/gitlab-ce!25385

Add project level config for merge pipelines

See merge request gitlab-org/gitlab-ee!9572

Jira: make issue links title compact

See merge request gitlab-org/gitlab-ce!25609

Port of a community contribution from @glensc to upstream.

Merge branch '9933-updatemaxseatsusedforgitlabcomsubscriptionsworker-attempts-to-run-on-geo-secondary' into 'master'

Guard if DB is read only

Closes #9933

See merge request gitlab-org/gitlab-ee!9703

Add dedicated group accounts flag & feature flag

See merge request gitlab-org/gitlab-ee!9625

Ensure notes insertion order same as draft note

Closes #9137

See merge request gitlab-org/gitlab-ee!9684

Bring back mentions of Redash

See merge request gitlab-org/gitlab-ce!25618