Add E2E QA email delivery tests

Closes gitlab-org/quality/testcases#247

See merge request gitlab-org/gitlab!20675

Depends on a new scenario defined in gitlab-qa that launches a docker
image for mailhog and makes sure that email delivery via smtp is
performed correctly

Add the ability to simulate a slow connection

See merge request gitlab-org/gitlab!20516

Can set QA_SIMULATE_SLOW_CONNECTION to simulate a slow connection
QA_SLOW_CONNECTION_LATENCY_MS sets additional latency in ms
QA_SLOW_CONNECTION_THROUGHPUT_KBPS sets the maximum throughput in kbps

[Backend (Model, Presenter)] Rename ConvDev Index to DevOps Score

See merge request gitlab-org/gitlab!20644

Add merge_request_event to CI_PIPELINE_SOURCE list of possible values.

See merge request gitlab-org/gitlab!21070

Fix typo in fork_sample_project.md

See merge request gitlab-org/gitlab!21082

Move merge request description into discussions tab

See merge request gitlab-org/gitlab!18940

Updated jekyll project_template

Closes #34685

See merge request gitlab-org/gitlab!20090

Updated hugo project_template

See merge request gitlab-org/gitlab!20109

Updated hexo project_template

See merge request gitlab-org/gitlab!20105

Put docs branch naming back into guidelines

See merge request gitlab-org/gitlab!21013

add Pipeline for external PR link

See merge request gitlab-org/gitlab!20439

Add body data elements for pageview context

See merge request gitlab-org/gitlab!18450

Update copy on managed namespace prefixes

See merge request gitlab-org/gitlab!20935

Changes can now be made to existing environments by clearing the cluster
cache.

See https://gitlab.com/gitlab-org/gitlab/issues/27149

Refactor many tests to use the login flow

See merge request gitlab-org/gitlab!21044

Move some utils karma specs to jest

See merge request gitlab-org/gitlab!21071

docs updated for what "default" branch protection means for global setting.

See merge request gitlab-org/gitlab!20547

Update best practices with note for `after` hook

See merge request gitlab-org/gitlab!20830

Allow patch notes on tags page to word wrap

Closes #33482

See merge request gitlab-org/gitlab!20135

Port Feature Flag Tests to Jest

See merge request gitlab-org/gitlab!20882

Upgrade CI image to Go 1.12

Closes #37937

See merge request gitlab-org/gitlab!21072

Revert "Merge branch 'ab/keyset-pagination' into 'master'"

See merge request gitlab-org/gitlab!21047

This moves the description of the merge request
into a 'Overview' tab. The overview tab will now hold
the merge request widget, description and discussions.

https://gitlab.com/gitlab-org/gitlab/issues/33813

Enable searching of projects by full path

See merge request gitlab-org/gitlab!20659

**How?**

Used [migrate-karma-to-jest][1] utility with some manual
intervention

[1]: https://gitlab.com/gitlab-org/frontend/playground/migrate-karma-to-jest

This is needed for Gitaly, which now requires Go 1.12.

Closes https://gitlab.com/gitlab-org/gitlab/issues/37937

This reverts merge request !19623

Do not exit during specs from `import.rake`

See merge request gitlab-org/gitlab!21054

Merge branch '36945-increase-cpu-memory-request-limit-for-various-review-app-components' into 'master'

Increase CPU & memory request/limit for various Review App components

Closes #36945

See merge request gitlab-org/gitlab!20533

Run migrations tests in dedicated jobs

Closes #37417 and #36715

See merge request gitlab-org/gitlab!20845

Flush sidekiq queues before running import_rake_spec.rb

See merge request gitlab-org/gitlab!21065

This stubs `exit 1` call to raise exception always.

Resolve "Refactor tracking code in container registry"

Closes #37910

See merge request gitlab-org/gitlab!21029