Speedup CI jobs

See merge request gitlab-org/gitlab-ce!14911

Docs guidelines: cherry-picking commits from CE to EE

Closes #41338 and #28822

See merge request gitlab-org/gitlab-ce!17367

Refactoring changes to support cluster metrics in EE

Closes #42820

See merge request gitlab-org/gitlab-ce!17336

Lazy fetch parent commits for a commit

See merge request gitlab-org/gitlab-ce!17559

Unify lib/api/job_artifacts.rb with EE

See merge request gitlab-org/gitlab-ce!17556

Port of ee translations

See merge request gitlab-org/gitlab-ce!17526

Fix project dashboard showing the wrong timestamps

Closes #27181

See merge request gitlab-org/gitlab-ce!17504

Add archive feature to trace

Closes #43022 and gitlab-ee#4170

See merge request gitlab-org/gitlab-ce!17314

Document required PG extensions

Closes #43798

See merge request gitlab-org/gitlab-ce!17491

Breadcrumbs on Project Tags

Closes #43924

See merge request gitlab-org/gitlab-ce!17562

Resolve "API endpoint for exporting project"

Closes #29130

See merge request gitlab-org/gitlab-ce!15860

This should speed up a bit some jobs.

Also, use ruby:2.4-alpine image in the flaky-examples-check job
Signed-off-by: Rémy Coutable <remy@rymai.me>

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

# Conflicts:
#	spec/models/clusters/applications/prometheus_spec.rb

Fix Gitaly n+1 in NetworkController#show

Closes #37602 and gitaly#1056

See merge request gitlab-org/gitlab-ce!17548

Add overview of branches and filtered views for active/stale branches

Closes #40187 et #17293

See merge request gitlab-org/gitlab-ce!15402

Integrate two workers into one ArchiveTraceWorker with pipeline_background queue. This queue takes loqer precedence than pipeline_default.