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.

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

Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

Fix enabling project deploy key for admins

See merge request gitlab-org/gitlab-ce!23043

Updated Gitaly to v0.133.0

See merge request gitlab-org/gitlab-ce!23148

Update asciidoctor to 1.5.8

Closes #54010

See merge request gitlab-org/gitlab-ce!23047

Don't show memory usage graph for unmerged MRs

Closes #49479

See merge request gitlab-org/gitlab-ce!22673

Fix not render emoji in filter dropdown

See merge request gitlab-org/gitlab-ce!23112

Docs: Fix zero downtime link in requirements

See merge request gitlab-org/gitlab-ce!23170

Fix broken link for Manual actions to "when:manual" section

See merge request gitlab-org/gitlab-ce!23160

Refactor CE Documentation Homepage

Closes #53124

See merge request gitlab-org/gitlab-ce!21946

Fix typos in specs and docs

See merge request gitlab-org/gitlab-ce!23084

Fix typo (install_depedencies => install_dependencies)

See merge request gitlab-org/gitlab-ce!23134

Also:

- Replace DevOps image with one with all stages.
- Further restructure page.
- Edit and tabulate lower part of page.