Merge branch 'ee-19745-forms-with-task-lists-can-be-overwritten-when-editing-simultaneously' into 'master'

EE port of task list improvements MR

See merge request gitlab-org/gitlab-ee!9365

Docs: EE Port: Fix some references to the mirroring doc

See merge request gitlab-org/gitlab-ee!9406

EE Port: Docs: Fix link references for artifacts

See merge request gitlab-org/gitlab-ee!9384

This fixes the cluster installation processing
spinner on the installation buttons.

[EE] Reduce diff with CE in Groups::CreateService

See merge request gitlab-org/gitlab-ee!9397

Simplify Epic::DateSourceMilestonesFinder

See merge request gitlab-org/gitlab-ee!8988

Fix migration error when project repository is missing

See merge request gitlab-org/gitlab-ee!9392

Hide github access token in repository settings

See merge request gitlab-org/gitlab-ee!9381

[EE] Reduce diff with CE in Ci::PipelineTriggerService

See merge request gitlab-org/gitlab-ee!9394

Signed-off-by: Rémy Coutable <remy@rymai.me>

Prevent fellow maintainers from seeing a github access token in the
repository settings

Signed-off-by: Rémy Coutable <remy@rymai.me>

[EE] Add an E2E test of push with the file size limit set

See merge request gitlab-org/gitlab-ee!9366

just small style changes and sanitizing a parameter

https://gitlab.com/gitlab-org/gitlab-ce/issues/19745

Fix Kerberos authentication

Closes #9519

See merge request gitlab-org/gitlab-ee!9390

Remove legacy :disable_gitaly metadata in specs

Closes gitlab-ce#53605

See merge request gitlab-org/gitlab-ee!9376

The data migration looks for code owner file and errs
if repository is missing.

EE compatibility port: CE Remove d3 metrics graph

See merge request gitlab-org/gitlab-ee!9308

Signed-off-by: Rémy Coutable <remy@rymai.me>

Signed-off-by: Rémy Coutable <remy@rymai.me>

Fix typo in github_integration.md

See merge request gitlab-org/gitlab-ee!9382

EE port of "Add e2e QA test for logging in using Github OAuth"

See merge request gitlab-org/gitlab-ee!9369

Feature flags page fixes

See merge request gitlab-org/gitlab-ee!9358

Use 'GlButton' in place of button within Epic app

See merge request gitlab-org/gitlab-ee!9372

Remove `DateSourcingMilestonesFinder` and unify code for batch and
single updates

Adds the test itself and the vendor page object model for GitHub
login pages.