Backport of gitlab-ee!13735

See merge request gitlab-org/gitlab-ce!29289

Merge branch '63010-visual-regression-in-12-0-line-numbers-not-lining-up-in-file-view' into 'master'

Resolve "Visual regression in 12.0: line numbers not lining up in file view"

Closes #63010

See merge request gitlab-org/gitlab-ce!29403

Fix "Resolve conflicts" button not appearing for some users

Closes #47954

See merge request gitlab-org/gitlab-ce!29535

Style popovers according to the design specs

See merge request gitlab-org/gitlab-ce!28375

Bump omniauth_openid_connect to 0.3.1

See merge request gitlab-org/gitlab-ce!29387

Fix null source_project_id in pool_repositories

Closes gitaly#1653

See merge request gitlab-org/gitlab-ce!29157

Added links to Jira/Jenkins videos to supplement docs

See merge request gitlab-org/gitlab-ce!29516

Switch charts to Prometheus API endpoint CE-3

Closes #58516

See merge request gitlab-org/gitlab-ce!29280

Upgrade pages to v1.6.1

Closes gitlab-pages#228

See merge request gitlab-org/gitlab-ce!29559

Fix diverged branch locals

See merge request gitlab-org/gitlab-ce!29508

Switch charts to Prometheus API endpoint CE-2

See merge request gitlab-org/gitlab-ce!29226

Moved RackTimeout observer to a different location and ignore transition states

See merge request gitlab-org/gitlab-ce!29214

Whitelist query limiting admin usage data endpoint

See merge request gitlab-org/gitlab-ce!29488

Added link to GitFlow video

See merge request gitlab-org/gitlab-ce!29517

[CE for Part 5] 5276 Extract ide_status_list from ide_status_bar

See merge request gitlab-org/gitlab-ce!29371

**Why?**
The ide_status_list will be used and extended in EE.

Resolve "Email notifications do not work properly (issue due date)"

Closes #58433

See merge request gitlab-org/gitlab-ce!28835

Fix Typos

See merge request gitlab-org/gitlab-ce!29551

Add link to Auto DevOps video

See merge request gitlab-org/gitlab-ce!29520

Add links to CI/CD videos

See merge request gitlab-org/gitlab-ce!29526

Change the feature freeze details

See merge request gitlab-org/gitlab-ce!29548

(CE Port) [New Auto Merge Strategy] Merge Train

See merge request gitlab-org/gitlab-ce!29485

Resolve "Remove unnecessary decimal places on chart axes"

Closes #59651

See merge request gitlab-org/gitlab-ce!29468

Add EE backport for the admin view

See merge request gitlab-org/gitlab-ce!29268

Upgrade to Capybara 3

See merge request gitlab-org/gitlab-ce!27776

Moves table pagination component

Closes #62788

See merge request gitlab-org/gitlab-ce!29543

AddToMergeTrainWhenPipelineSucceeds and MergeTrain