Match users better by their private commit email

Closes #54046

See merge request gitlab-org/gitlab-ce!23080

Backport of ee/8120: Smartcard authentication

See merge request gitlab-org/gitlab-ce!23012

Upgrade @gitlab/svg to 1.38.0

See merge request gitlab-org/gitlab-ce!23177

Improve variables support

See merge request gitlab-org/gitlab-ce!23077

Add support for surfacing a link to the branch or tag name in push message…

Closes #51959

See merge request gitlab-org/gitlab-ce!22651

This ensures that variables accept only string,
alongside also improves kubernetes_namespace,
improving validation and default value being set.

Private commit emails were introduced in !22560, but some parts of
GitLab were not updated to take account of them. This commit adds
support in places that were missed.

Refactor Member#add_user for GitLab EE

See merge request gitlab-org/gitlab-ce!23119

Fix some "Introduced in" inconsistencies

See merge request gitlab-org/gitlab-ce!23154

Documentation: update Libre -> Core

See merge request gitlab-org/gitlab-ce!22533

Update the cluster docs for Knative

See merge request gitlab-org/gitlab-ce!23113

Revert "Merge branch 'docs/split-front-page' into 'master'"

Closes #54211

See merge request gitlab-org/gitlab-ce!23179

Auto DevOps support for Group Security Dashboard

See merge request gitlab-org/gitlab-ce!23165

This reverts merge request
https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/21946

Merge branch '54093-the-default_value_for-gem-doesn-t-handle-actioncontroller-parameters-correctly' into 'master'

Replace the `default_value_for` gem with the `gitlab-default_value_with` gem which handles `ActionController::Parameters` correctly

Closes #54093

See merge request gitlab-org/gitlab-ce!23114

Update asana to 0.8.1

Closes #54004

See merge request gitlab-org/gitlab-ce!23039

Resolve "Search filter bar for issues dashboard list"

Closes #53584, #52430, and #52385

See merge request gitlab-org/gitlab-ce!22641

Remove broken badge from overview table

See merge request gitlab-org/gitlab-ce!23173

Improve memory performance by reducing dirty pages before fork

See merge request gitlab-org/gitlab-ce!23169