Also:
- stub MutationObserver in Jest

A recent update in [GitLab UI] and setting the [config.assets.paths] to
include `node_modules` for the resolution of SCSS imports, allows us to
have much nicer imports which don't rely on brittle relative paths.

This change also forwards @gitlab/ui to the newest version

[GitLab UI]: https://gitlab.com/gitlab-org/gitlab-ui/merge_requests/602
[config.assets.paths]: https://gitlab.com/gitlab-org/gitlab-ce/blob/d9026d0ffa0/config/application.rb#L169

Get memory data after booting app in production

Closes #63585

See merge request gitlab-org/gitlab-ce!30031

Doc backport: Add `/relate` quick action

See merge request gitlab-org/gitlab-ce!29803

added code difference in `app/views/search/_category.html.haml` from EE to CE

See merge request gitlab-org/gitlab-ce!28755

CE port of https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14108

See merge request gitlab-org/gitlab-ce!29604

Preload the app in `production` env, hit it with a single request, and
gather total gem memory consumption data using `derailed exec perf:mem`
from `derailed_benchmarks`. Present the result as MR metrics.

Set higher TTL to write lock for traces

See merge request gitlab-org/gitlab-ce!30064

Document the security tools maintenance and vulnerabilities DB update

Closes gitlab-ee#9986

See merge request gitlab-org/gitlab-ce!29840

Support CIDR notation in IP rate limiter

See merge request gitlab-org/gitlab-ce!30146

Added commit type to tree GraphQL type

See merge request gitlab-org/gitlab-ce!29412

Extract MR's widget into a separate request

Closes #62723

See merge request gitlab-org/gitlab-ce!29979

Do not change updated_at on an issue when reordering on an issue board

See merge request gitlab-org/gitlab-ce!29677

Backport CE changes for multiple GroupSAML support

See merge request gitlab-org/gitlab-ce!30102

Resolve "Environment details header border misaligned"

Closes #62968

See merge request gitlab-org/gitlab-ce!30011

CE backport for gitlab-org/gitlab-ee!11859: Update description text of "Merge requests" section of general project settings page

See merge request gitlab-org/gitlab-ce!27838

Removes EE differences for app/views/projects/tree/_tree_header.html.haml

See merge request gitlab-org/gitlab-ce!30117

Edit Cluster Admin note text

Closes #63558

See merge request gitlab-org/gitlab-ce!29965

Remove N+1 queries in boards API

See merge request gitlab-org/gitlab-ce!29634

Vue-i18n: autofix for app/assets/javascripts/performance_bar directory

See merge request gitlab-org/gitlab-ce!30014

This commits extracts /merge_requests/1.json?serializer=widget
Into a separate /merge_requests/1/widget.json endpoint
This will allow to use caching for this request

Add diagram to site architecture docs

See merge request gitlab-org/gitlab-ce!30147

GraphQL mutations for add, remove and toggle emoji

See merge request gitlab-org/gitlab-ce!29919

Rearrange discussion resolve buttons

Closes #58689

See merge request gitlab-org/gitlab-ce!29779

- next-discuss button is always show unless there is only 1 discussion
- regroup buttons arrangements

This will make it possible to whitelist multiple IP addresses
(e.g. 192.168.0.1/24).

Support jsonb Default Value in add_column_with_default Migration Helper

See merge request gitlab-org/gitlab-ce!29871

This commit makes it possible for
https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/14420 to handle
multiple SAML providers.

Fix broken style guide links

See merge request gitlab-org/gitlab-ce!30149

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/57874

Closes #57874

See merge request gitlab-org/gitlab-ce!30013

Set higher TTL is safer option when it comes to long running archive

Application Development Platform docs updates

See merge request gitlab-org/gitlab-ce!30058