This commit adds the new auto merge strategy "Add to Merge Train When
Pipeline succeeds". It works similarily with MWPS, but it adds to
merge train instead of merging.

[New Auto Merge Strategy] Merge Train

See merge request gitlab-org/gitlab-ee!13278

Review roulette excludes mr_author

Closes #61157

See merge request gitlab-org/gitlab-ce!28886

Onboarding app component

See merge request gitlab-org/gitlab-ee!13953

- Add specs for app component
- Add Vuex store and specs
- Mount app and setup store
- Add styles for popover
- Add tour titles and exit tour content
- Add empty tour parts
- Update PO file
- Add skeleton for action popover utils

Add trackEvent when accessing the Register tab

See merge request gitlab-org/gitlab-ce!29336

Add trackEvent when accessing the Register tab

See merge request gitlab-org/gitlab-ee!13995

Added naming convention for .graphql files

See merge request gitlab-org/gitlab-ce!29558

Add quotes to redirect value

Closes #63165

See merge request gitlab-org/gitlab-ce!29584

This is a no-op for CE.

AddToMergeTrainWhenPipelineSucceeds and MergeTrain

Add dependency proxy to permissions.md

Closes gitlab-ee#12075

See merge request gitlab-org/gitlab-ce!29497

Docs: Convert absolute links to relative in /ci docs

See merge request gitlab-org/gitlab-ce!29029

Leave clear notices in docs about after_script execution context

Closes gitlab-runner#4146

See merge request gitlab-org/gitlab-ce!29510

Removed duplicate content on scoped labels

See merge request gitlab-org/gitlab-ce!29579

Document how to troubleshoot a pending external-dns deployment

See merge request gitlab-org/gitlab-ce!29290

Also update the Review Apps node pools description
Signed-off-by: Rémy Coutable <remy@rymai.me>

Update quick start guide doc to suggest views and methods to be defined in alphabetical order

Closes #62505

See merge request gitlab-org/gitlab-ce!29499

Closes https://gitlab.com/gitlab-org/gitlab-ce/issues/62505

CE port of "Comment will select all activites filter by default"

See merge request gitlab-org/gitlab-ce!29496

Comment will select all activities filter by default

Closes gitlab-org/quality/nightly#107

See merge request gitlab-org/gitlab-ee!14063

Excludes MR author from gitlab_ui and single_codebase Review roulette
results.

Add links to select YouTube videos demonstrating GitLab features to docs

See merge request gitlab-org/gitlab-ce!29562

Remove the grafana_dashboard_link feature flag

See merge request gitlab-org/gitlab-ce!29344

Adding break-word css to home-panel-description class to correctly word wrap long words

Closes #62134

See merge request gitlab-org/gitlab-ce!28695